25575990 has 128 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 5652480.

The previous prime is 25575989. The next prime is 25576003. The reversal of 25575990 is 9957552.

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 63 ways as a sum of consecutive naturals, for example, 263622 + ... + 263718.

It is an arithmetic number, because the mean of its divisors is an integer number (571536).

Almost surely, 2^25575990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25575990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36578304).

25575990 is an abundant number, since it is smaller than the sum of its proper divisors (47580618).

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

25575990 is a wasteful number, since it uses less digits than its factorization.

25575990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182.

The product of its (nonzero) digits is 141750, while the sum is 42.

The square root of 25575990 is about 5057.2710032190. The cubic root of 25575990 is about 294.6303519079.

It can be divided in two parts, 25575 and 990, that added together give a triangular number (26565 = T₂₃₀).

The spelling of 25575990 in words is "twenty-five million, five hundred seventy-five thousand, nine hundred ninety".