521325720 has 80 divisors (see below), whose sum is σ = 1752244560. Its totient is φ = 139019328.

The previous prime is 521325719. The next prime is 521325731. The reversal of 521325720 is 27523125.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 77212 + ... + 83691.

It is an arithmetic number, because the mean of its divisors is an integer number (21903057).

Almost surely, 2^521325720 is an apocalyptic number.

It is an amenable number.

521325720 is an abundant number, since it is smaller than the sum of its proper divisors (1230918840).

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

521325720 is a wasteful number, since it uses less digits than its factorization.

521325720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160926 (or 160913 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 521325720 is about 22832.5583323464. The cubic root of 521325720 is about 804.8279508347.

Adding to 521325720 its reverse (27523125), we get a palindrome (548848845).

The spelling of 521325720 in words is "five hundred twenty-one million, three hundred twenty-five thousand, seven hundred twenty".