625491640 has 16 divisors (see below), whose sum is σ = 1407356280. Its totient is φ = 250196640.

The previous prime is 625491583. The next prime is 625491649. The reversal of 625491640 is 46194526.

It is a self number, because there is not a number n which added to its sum of digits gives 625491640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625491649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7818606 + ... + 7818685.

Almost surely, 2^625491640 is an apocalyptic number.

It is an amenable number.

625491640 is an abundant number, since it is smaller than the sum of its proper divisors (781864640).

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

625491640 is a wasteful number, since it uses less digits than its factorization.

625491640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15637302 (or 15637298 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 625491640 is about 25009.8308670810. The cubic root of 625491640 is about 855.2120992675.

The spelling of 625491640 in words is "six hundred twenty-five million, four hundred ninety-one thousand, six hundred forty".