1625639320 has 32 divisors (see below), whose sum is σ = 3726706320. Its totient is φ = 637985920.

The previous prime is 1625639317. The next prime is 1625639321. The reversal of 1625639320 is 239365261.

It is a self number, because there is not a number n which added to its sum of digits gives 1625639320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625639321) 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, 381286 + ... + 385525.

Almost surely, 2^1625639320 is an apocalyptic number.

1625639320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1625639320 is an abundant number, since it is smaller than the sum of its proper divisors (2101067000).

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

1625639320 is a wasteful number, since it uses less digits than its factorization.

1625639320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766875 (or 766871 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 1625639320 is about 40319.2177503483. The cubic root of 1625639320 is about 1175.8215036752.

The spelling of 1625639320 in words is "one billion, six hundred twenty-five million, six hundred thirty-nine thousand, three hundred twenty".