28377760849 has 3 divisors (see below), whose sum is σ = 28377929307. Its totient is φ = 28377592392.

The previous prime is 28377760843. The next prime is 28377760889. The reversal of 28377760849 is 94806777382.

The square root of 28377760849 is 168457.

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., 5646771025 + 22730989824 = 75145^2 + 150768^2 .

It is not a de Polignac number, because 28377760849 - 2⁹ = 28377760337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28377760843) 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, 84229 + ... + 252685.

It is an arithmetic number, because the mean of its divisors is an integer number (9459309769).

Almost surely, 2^28377760849 is an apocalyptic number.

28377760849 is the 168457-th square number.

28377760849 is the 84229-th centered octagonal number.

It is an amenable number.

28377760849 is a deficient number, since it is larger than the sum of its proper divisors (168458).

28377760849 is an frugal number, since it uses more digits than its factorization.

28377760849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336914 (or 168457 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 61.

The spelling of 28377760849 in words is "twenty-eight billion, three hundred seventy-seven million, seven hundred sixty thousand, eight hundred forty-nine".