844821864 has 48 divisors (see below), whose sum is σ = 2299596000. Its totient is φ = 280187424.

The previous prime is 844821863. The next prime is 844821877. The reversal of 844821864 is 468128448.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (844821863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15154 + ... + 43809.

It is an arithmetic number, because the mean of its divisors is an integer number (47908250).

Almost surely, 2^844821864 is an apocalyptic number.

It is an amenable number.

844821864 is an abundant number, since it is smaller than the sum of its proper divisors (1454774136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

844821864 is a wasteful number, since it uses less digits than its factorization.

844821864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59174 (or 59167 counting only the distinct ones).

The product of its digits is 393216, while the sum is 45.

The square root of 844821864 is about 29065.8195136487. The cubic root of 844821864 is about 945.3407555877.

The spelling of 844821864 in words is "eight hundred forty-four million, eight hundred twenty-one thousand, eight hundred sixty-four".