25601979 has 12 divisors (see below), whose sum is σ = 36964536. Its totient is φ = 15754752.

The previous prime is 25601977. The next prime is 25602019. The reversal of 25601979 is 97910652.

It is not a de Polignac number, because 25601979 - 2¹ = 25601977 is a prime.

It is a super-2 number, since 2×25601979² = 1310922657432882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (25601977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24742 + ... + 25755.

It is an arithmetic number, because the mean of its divisors is an integer number (3080378).

Almost surely, 2^25601979 is an apocalyptic number.

25601979 is a deficient number, since it is larger than the sum of its proper divisors (11362557).

25601979 is a wasteful number, since it uses less digits than its factorization.

25601979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50526 (or 50513 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 25601979 is about 5059.8398195990. The cubic root of 25601979 is about 294.7301141730.

The spelling of 25601979 in words is "twenty-five million, six hundred one thousand, nine hundred seventy-nine".