25605990 has 32 divisors (see below), whose sum is σ = 68283360. Its totient is φ = 6828192.

The previous prime is 25605989. The next prime is 25605997. The reversal of 25605990 is 9950652.

25605990 is a `hidden beast` number, since 2 + 5 + 60 + 599 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25605997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47149 + ... + 47688.

It is an arithmetic number, because the mean of its divisors is an integer number (2133855).

Almost surely, 2^25605990 is an apocalyptic number.

25605990 is an abundant number, since it is smaller than the sum of its proper divisors (42677370).

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

25605990 is a wasteful number, since it uses less digits than its factorization.

25605990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94853 (or 94847 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 25605990 is about 5060.2361604969. The cubic root of 25605990 is about 294.7455049201.

The spelling of 25605990 in words is "twenty-five million, six hundred five thousand, nine hundred ninety".