25623990 has 96 divisors (see below), whose sum is σ = 77163840. Its totient is φ = 5778432.

The previous prime is 25623973. The next prime is 25624007. The reversal of 25623990 is 9932652.

25623990 is a `hidden beast` number, since 2 + 562 + 3 + 9 + 90 = 666.

It is an interprime number because it is at equal distance from previous prime (25623973) and next prime (25624007).

It is a Curzon number.

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, 55842 + ... + 56298.

It is an arithmetic number, because the mean of its divisors is an integer number (803790).

Almost surely, 2^25623990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25623990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38581920).

25623990 is an abundant number, since it is smaller than the sum of its proper divisors (51539850).

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

25623990 is a wasteful number, since it uses less digits than its factorization.

25623990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 563 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 25623990 is about 5062.0144211569. The cubic root of 25623990 is about 294.8145535608.

The spelling of 25623990 in words is "twenty-five million, six hundred twenty-three thousand, nine hundred ninety".