25597878 has 16 divisors (see below), whose sum is σ = 52847616. Its totient is φ = 8257320.

The previous prime is 25597867. The next prime is 25597879. The reversal of 25597878 is 87879552.

It is a self number, because there is not a number n which added to its sum of digits gives 25597878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25597879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68626 + ... + 68997.

It is an arithmetic number, because the mean of its divisors is an integer number (3302976).

Almost surely, 2^25597878 is an apocalyptic number.

25597878 is an abundant number, since it is smaller than the sum of its proper divisors (27249738).

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

25597878 is a wasteful number, since it uses less digits than its factorization.

25597878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137659.

The product of its digits is 1411200, while the sum is 51.

The square root of 25597878 is about 5059.4345533864. The cubic root of 25597878 is about 294.7143764216.

The spelling of 25597878 in words is "twenty-five million, five hundred ninety-seven thousand, eight hundred seventy-eight".