625249764 has 36 divisors (see below), whose sum is σ = 1582018620. Its totient is φ = 208215360.

The previous prime is 625249763. The next prime is 625249787. The reversal of 625249764 is 467942526.

625249764 is a `hidden beast` number, since 62 + 524 + 9 + 7 + 64 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 322489764 + 302760000 = 17958^2 + 17400^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×625249764³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (625249763) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 32094 + ... + 47754.

Almost surely, 2^625249764 is an apocalyptic number.

It is an amenable number.

625249764 is an abundant number, since it is smaller than the sum of its proper divisors (956768856).

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

625249764 is a wasteful number, since it uses less digits than its factorization.

625249764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16780 (or 16775 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 625249764 is about 25004.9947810432. The cubic root of 625249764 is about 855.1018489526.

The spelling of 625249764 in words is "six hundred twenty-five million, two hundred forty-nine thousand, seven hundred sixty-four".