626840680 has 32 divisors (see below), whose sum is σ = 1448513640. Its totient is φ = 243959040.

The previous prime is 626840659. The next prime is 626840681. The reversal of 626840680 is 86048626.

It can be written as a sum of positive squares in 4 ways, for example, as 490091044 + 136749636 = 22138^2 + 11694^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (626840681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210291 + ... + 213250.

Almost surely, 2^626840680 is an apocalyptic number.

It is an amenable number.

626840680 is an abundant number, since it is smaller than the sum of its proper divisors (821672960).

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

626840680 is a wasteful number, since it uses less digits than its factorization.

626840680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423589 (or 423585 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 626840680 is about 25036.7865350168. The cubic root of 626840680 is about 855.8264889823.

The spelling of 626840680 in words is "six hundred twenty-six million, eight hundred forty thousand, six hundred eighty".