284721489649 has 3 divisors (see below), whose sum is σ = 284722023243. Its totient is φ = 284720956056.

The previous prime is 284721489587. The next prime is 284721489653. The reversal of 284721489649 is 946984127482.

The square root of 284721489649 is 533593.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4491010225 + 280230479424 = 67015^2 + 529368^2 .

It is not a de Polignac number, because 284721489649 - 2¹⁷ = 284721358577 is a prime.

It is a super-2 number, since 2×284721489649² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (284721489749) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 266797 + ... + 800389.

It is an arithmetic number, because the mean of its divisors is an integer number (94907341081).

Almost surely, 2^284721489649 is an apocalyptic number.

284721489649 is the 533593-rd square number.

284721489649 is the 266797-th centered octagonal number.

It is an amenable number.

284721489649 is a deficient number, since it is larger than the sum of its proper divisors (533594).

284721489649 is an frugal number, since it uses more digits than its factorization.

284721489649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067186 (or 533593 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 64.

Multiplying 284721489649 by its sum of digits (64), we get a square (18222175337536 = 4268744²).

It can be divided in two parts, 2847 and 21489649, that added together give a square (21492496 = 4636²).

The spelling of 284721489649 in words is "two hundred eighty-four billion, seven hundred twenty-one million, four hundred eighty-nine thousand, six hundred forty-nine".