626406642 has 32 divisors (see below), whose sum is σ = 1409644800. Its totient is φ = 206157744.

The previous prime is 626406631. The next prime is 626406643. The reversal of 626406642 is 246604626.

626406642 is a `hidden beast` number, since 6 + 2 + 6 + 4 + 0 + 6 + 642 = 666.

626406642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×626406642² = 784770562283432328, which contains 22 as substring.

626406642 is a modest number, since divided by 6642 gives 6264 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 626406597 and 626406606.

It is not an unprimeable number, because it can be changed into a prime (626406643) 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, 69153 + ... + 77684.

It is an arithmetic number, because the mean of its divisors is an integer number (44051400).

Almost surely, 2^626406642 is an apocalyptic number.

626406642 is an abundant number, since it is smaller than the sum of its proper divisors (783238158).

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

626406642 is a wasteful number, since it uses less digits than its factorization.

626406642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146927 (or 146921 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 626406642 is about 25028.1170286540. The cubic root of 626406642 is about 855.6289124697.

The spelling of 626406642 in words is "six hundred twenty-six million, four hundred six thousand, six hundred forty-two".