1625609916 has 144 divisors (see below), whose sum is σ = 4940103168. Its totient is φ = 440668800.

The previous prime is 1625609903. The next prime is 1625609929. The reversal of 1625609916 is 6199065261.

It is a happy number.

1625609916 is a `hidden beast` number, since 1 + 6 + 25 + 609 + 9 + 16 = 666.

1625609916 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1625609903) and next prime (1625609929).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 758206 + ... + 760346.

It is an arithmetic number, because the mean of its divisors is an integer number (34306272).

Almost surely, 2^1625609916 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 1625609916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2470051584).

1625609916 is an abundant number, since it is smaller than the sum of its proper divisors (3314493252).

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

1625609916 is a wasteful number, since it uses less digits than its factorization.

1625609916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 1625609916 is about 40318.8531086885. The cubic root of 1625609916 is about 1175.8144143487.

The spelling of 1625609916 in words is "one billion, six hundred twenty-five million, six hundred nine thousand, nine hundred sixteen".