680620628 has 6 divisors (see below), whose sum is σ = 1191086106. Its totient is φ = 340310312.

The previous prime is 680620627. The next prime is 680620657. The reversal of 680620628 is 826026086.

It can be written as a sum of positive squares in only one way, i.e., 442597444 + 238023184 = 21038^2 + 15428^2 .

It is a super-2 number, since 2×680620628² = 926488878518228768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 680620591 and 680620600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680620621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85077575 + ... + 85077582.

It is an arithmetic number, because the mean of its divisors is an integer number (198514351).

Almost surely, 2^680620628 is an apocalyptic number.

It is an amenable number.

680620628 is a deficient number, since it is larger than the sum of its proper divisors (510465478).

680620628 is a wasteful number, since it uses less digits than its factorization.

680620628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170155161 (or 170155159 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 680620628 is about 26088.7069054792. The cubic root of 680620628 is about 879.6333820637.

The spelling of 680620628 in words is "six hundred eighty million, six hundred twenty thousand, six hundred twenty-eight".