626680021 has 16 divisors (see below), whose sum is σ = 722050560. Its totient is φ = 537911280.

The previous prime is 626680013. The next prime is 626680051. The reversal of 626680021 is 120086626.

It is not a de Polignac number, because 626680021 - 2³ = 626680013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (626680001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59280 + ... + 69046.

It is an arithmetic number, because the mean of its divisors is an integer number (45128160).

Almost surely, 2^626680021 is an apocalyptic number.

It is an amenable number.

626680021 is a deficient number, since it is larger than the sum of its proper divisors (95370539).

626680021 is a wasteful number, since it uses less digits than its factorization.

626680021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10104.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 626680021 is about 25033.5778705322. The cubic root of 626680021 is about 855.7533667464.

The spelling of 626680021 in words is "six hundred twenty-six million, six hundred eighty thousand, twenty-one".