25621864 has 8 divisors (see below), whose sum is σ = 48041010. Its totient is φ = 12810928.

The previous prime is 25621859. The next prime is 25621879. The reversal of 25621864 is 46812652.

It can be written as a sum of positive squares in only one way, i.e., 24502500 + 1119364 = 4950^2 + 1058^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1601359 + ... + 1601374.

Almost surely, 2^25621864 is an apocalyptic number.

It is an amenable number.

25621864 is a deficient number, since it is larger than the sum of its proper divisors (22419146).

25621864 is a wasteful number, since it uses less digits than its factorization.

25621864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202739 (or 3202735 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 25621864 is about 5061.8044213502. The cubic root of 25621864 is about 294.8063998336.

The spelling of 25621864 in words is "twenty-five million, six hundred twenty-one thousand, eight hundred sixty-four".