626189640 has 32 divisors (see below), whose sum is σ = 1878569280. Its totient is φ = 166983872.

The previous prime is 626189639. The next prime is 626189653. The reversal of 626189640 is 46981626.

It is a super-2 number, since 2×626189640² = 784226930486659200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 626189592 and 626189601.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609004 + ... + 2609243.

It is an arithmetic number, because the mean of its divisors is an integer number (58705290).

Almost surely, 2^626189640 is an apocalyptic number.

626189640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

626189640 is an abundant number, since it is smaller than the sum of its proper divisors (1252379640).

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

626189640 is a wasteful number, since it uses less digits than its factorization.

626189640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5218261 (or 5218257 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 626189640 is about 25023.7814888158. The cubic root of 626189640 is about 855.5300977289.

The spelling of 626189640 in words is "six hundred twenty-six million, one hundred eighty-nine thousand, six hundred forty".