626638440 has 32 divisors (see below), whose sum is σ = 1879915680. Its totient is φ = 167103552.

The previous prime is 626638429. The next prime is 626638477. The reversal of 626638440 is 44836626.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2610874 + ... + 2611113.

It is an arithmetic number, because the mean of its divisors is an integer number (58747365).

Almost surely, 2^626638440 is an apocalyptic number.

626638440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

626638440 is an abundant number, since it is smaller than the sum of its proper divisors (1253277240).

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

626638440 is a wasteful number, since it uses less digits than its factorization.

626638440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5222001 (or 5221997 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The square root of 626638440 is about 25032.7473522185. The cubic root of 626638440 is about 855.7344395605.

The spelling of 626638440 in words is "six hundred twenty-six million, six hundred thirty-eight thousand, four hundred forty".