25991064 has 64 divisors (see below), whose sum is σ = 78768000. Its totient is φ = 7875360.

The previous prime is 25991039. The next prime is 25991071. The reversal of 25991064 is 46019952.

25991064 is a `hidden beast` number, since 2 + 599 + 1 + 0 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3094 + ... + 7845.

It is an arithmetic number, because the mean of its divisors is an integer number (1230750).

Almost surely, 2^25991064 is an apocalyptic number.

25991064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25991064 is an abundant number, since it is smaller than the sum of its proper divisors (52776936).

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

25991064 is a wasteful number, since it uses less digits than its factorization.

25991064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10965 (or 10955 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 25991064 is about 5098.1431913982. The cubic root of 25991064 is about 296.2156633814.

It can be divided in two parts, 2599 and 1064, that added together give a palindrome (3663).

The spelling of 25991064 in words is "twenty-five million, nine hundred ninety-one thousand, sixty-four".