625464640 has 56 divisors (see below), whose sum is σ = 1492145352. Its totient is φ = 249722880.

The previous prime is 625464611. The next prime is 625464643. The reversal of 625464640 is 46464526.

It can be written as a sum of positive squares in 4 ways, for example, as 57881664 + 567582976 = 7608^2 + 23824^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 625464640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625464643) 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 7 ways as a sum of consecutive naturals, for example, 210042 + ... + 212998.

Almost surely, 2^625464640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 625464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746072676).

625464640 is an abundant number, since it is smaller than the sum of its proper divisors (866680712).

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

625464640 is a wasteful number, since it uses less digits than its factorization.

625464640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 625464640 is about 25009.2910735191. The cubic root of 625464640 is about 855.1997937159.

The spelling of 625464640 in words is "six hundred twenty-five million, four hundred sixty-four thousand, six hundred forty".