25668978 has 16 divisors (see below), whose sum is σ = 51490080. Its totient is φ = 8530976.

The previous prime is 25668959. The next prime is 25669001. The reversal of 25668978 is 87986652.

It is a self number, because there is not a number n which added to its sum of digits gives 25668978.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4083 + ... + 8246.

It is an arithmetic number, because the mean of its divisors is an integer number (3218130).

Almost surely, 2^25668978 is an apocalyptic number.

25668978 is an abundant number, since it is smaller than the sum of its proper divisors (25821102).

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

25668978 is a wasteful number, since it uses less digits than its factorization.

25668978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12681.

The product of its digits is 1451520, while the sum is 51.

The square root of 25668978 is about 5066.4561579076. The cubic root of 25668978 is about 294.9869878393.

The spelling of 25668978 in words is "twenty-five million, six hundred sixty-eight thousand, nine hundred seventy-eight".