25532979 has 16 divisors (see below), whose sum is σ = 36192000. Its totient is φ = 15965856.

The previous prime is 25532977. The next prime is 25532981. The reversal of 25532979 is 97923552.

25532979 = 446² + 447² + ... + 548².

It is an interprime number because it is at equal distance from previous prime (25532977) and next prime (25532981).

It is not a de Polignac number, because 25532979 - 2¹ = 25532977 is a prime.

It is a super-2 number, since 2×25532979² = 1303866033228882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25532979.

It is not an unprimeable number, because it can be changed into a prime (25532971) 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, 3697 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (2262000).

Almost surely, 2^25532979 is an apocalyptic number.

25532979 is a deficient number, since it is larger than the sum of its proper divisors (10659021).

25532979 is a wasteful number, since it uses less digits than its factorization.

25532979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4474.

The product of its digits is 170100, while the sum is 42.

The square root of 25532979 is about 5053.0168216621. The cubic root of 25532979 is about 294.4650998313.

The spelling of 25532979 in words is "twenty-five million, five hundred thirty-two thousand, nine hundred seventy-nine".