25299978 has 32 divisors (see below), whose sum is σ = 58449600. Its totient is φ = 7215360.

The previous prime is 25299949. The next prime is 25299979. The reversal of 25299978 is 87999252.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25299978.

It is not an unprimeable number, because it can be changed into a prime (25299979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10153 + ... + 12396.

It is an arithmetic number, because the mean of its divisors is an integer number (1826550).

Almost surely, 2^25299978 is an apocalyptic number.

25299978 is an abundant number, since it is smaller than the sum of its proper divisors (33149622).

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

25299978 is a wasteful number, since it uses less digits than its factorization.

25299978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22582.

The product of its digits is 816480, while the sum is 51.

The square root of 25299978 is about 5029.9083490656. The cubic root of 25299978 is about 293.5666483385.

It can be divided in two parts, 25 and 299978, that added together give a palindrome (300003).

The spelling of 25299978 in words is "twenty-five million, two hundred ninety-nine thousand, nine hundred seventy-eight".