521206628 has 6 divisors (see below), whose sum is σ = 912111606. Its totient is φ = 260603312.

The previous prime is 521206597. The next prime is 521206667. The reversal of 521206628 is 826602125.

It can be written as a sum of positive squares in only one way, i.e., 376437604 + 144769024 = 19402^2 + 12032^2 .

It is a super-2 number, since 2×521206628² = 543312698142260768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 521206594 and 521206603.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65150825 + ... + 65150832.

It is an arithmetic number, because the mean of its divisors is an integer number (152018601).

Almost surely, 2^521206628 is an apocalyptic number.

It is an amenable number.

521206628 is a deficient number, since it is larger than the sum of its proper divisors (390904978).

521206628 is a wasteful number, since it uses less digits than its factorization.

521206628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130301661 (or 130301659 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 521206628 is about 22829.9502408569. The cubic root of 521206628 is about 804.7666610203.

The spelling of 521206628 in words is "five hundred twenty-one million, two hundred six thousand, six hundred twenty-eight".