25424978 has 4 divisors (see below), whose sum is σ = 38137470. Its totient is φ = 12712488.

The previous prime is 25424977. The next prime is 25424989. The reversal of 25424978 is 87942452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16104169 + 9320809 = 4013^2 + 3053^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25424977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6356243 + ... + 6356246.

Almost surely, 2^25424978 is an apocalyptic number.

25424978 is a deficient number, since it is larger than the sum of its proper divisors (12712492).

25424978 is a wasteful number, since it uses less digits than its factorization.

25424978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12712491.

The product of its digits is 161280, while the sum is 41.

The square root of 25424978 is about 5042.3187126559. The cubic root of 25424978 is about 294.0493307322.

The spelling of 25424978 in words is "twenty-five million, four hundred twenty-four thousand, nine hundred seventy-eight".