521374028 has 24 divisors (see below), whose sum is σ = 1088086272. Its totient is φ = 213730704.

The previous prime is 521373997. The next prime is 521374033. The reversal of 521374028 is 820473125.

It is a junction number, because it is equal to n+sod(n) for n = 521373985 and 521374003.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 404150 + ... + 405437.

It is an arithmetic number, because the mean of its divisors is an integer number (45336928).

Almost surely, 2^521374028 is an apocalyptic number.

It is an amenable number.

521374028 is an abundant number, since it is smaller than the sum of its proper divisors (566712244).

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

521374028 is a wasteful number, since it uses less digits than its factorization.

521374028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809621 (or 809619 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 521374028 is about 22833.6161831629. The cubic root of 521374028 is about 804.8528095275.

It can be divided in two parts, 52137 and 4028, that added together give a palindrome (56165).

The spelling of 521374028 in words is "five hundred twenty-one million, three hundred seventy-four thousand, twenty-eight".