25111980 has 36 divisors (see below), whose sum is σ = 76173552. Its totient is φ = 6696480.

The previous prime is 25111979. The next prime is 25111981. The reversal of 25111980 is 8911152.

It is an interprime number because it is at equal distance from previous prime (25111979) and next prime (25111981).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×25111980² = 1261223079040800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25111981) 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, 69576 + ... + 69935.

It is an arithmetic number, because the mean of its divisors is an integer number (2115932).

Almost surely, 2^25111980 is an apocalyptic number.

25111980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25111980 is an abundant number, since it is smaller than the sum of its proper divisors (51061572).

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

25111980 is a wasteful number, since it uses less digits than its factorization.

25111980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139526 (or 139521 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 25111980 is about 5011.1854884847. The cubic root of 25111980 is about 292.8376989442.

The spelling of 25111980 in words is "twenty-five million, one hundred eleven thousand, nine hundred eighty".