625436538 has 32 divisors (see below), whose sum is σ = 1273733952. Its totient is φ = 204681600.

The previous prime is 625436489. The next prime is 625436549. The reversal of 625436538 is 835634526.

It is a self number, because there is not a number n which added to its sum of digits gives 625436538.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251670 + ... + 254142.

It is an arithmetic number, because the mean of its divisors is an integer number (39804186).

Almost surely, 2^625436538 is an apocalyptic number.

625436538 is an abundant number, since it is smaller than the sum of its proper divisors (648297414).

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

625436538 is a wasteful number, since it uses less digits than its factorization.

625436538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3230.

The product of its digits is 518400, while the sum is 42.

The square root of 625436538 is about 25008.7292360088. The cubic root of 625436538 is about 855.1869855394.

The spelling of 625436538 in words is "six hundred twenty-five million, four hundred thirty-six thousand, five hundred thirty-eight".