25597980 has 36 divisors (see below), whose sum is σ = 77647752. Its totient is φ = 6826080.

The previous prime is 25597963. The next prime is 25598017. The reversal of 25597980 is 8979552.

It is a happy number.

25597980 is a `hidden beast` number, since 2 + 559 + 7 + 98 + 0 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70926 + ... + 71285.

It is an arithmetic number, because the mean of its divisors is an integer number (2156882).

Almost surely, 2^25597980 is an apocalyptic number.

25597980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25597980 is an abundant number, since it is smaller than the sum of its proper divisors (52049772).

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

25597980 is a wasteful number, since it uses less digits than its factorization.

25597980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142226 (or 142221 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 25597980 is about 5059.4446335542. Note that the first 3 decimals coincide. The cubic root of 25597980 is about 294.7147678711.

The spelling of 25597980 in words is "twenty-five million, five hundred ninety-seven thousand, nine hundred eighty".