25440000008 has 8 divisors (see below), whose sum is σ = 47700000030. Its totient is φ = 12720000000.

The previous prime is 25440000007. The next prime is 25440000029. The reversal of 25440000008 is 80000004452.

It can be written as a sum of positive squares in only one way, i.e., 23379021604 + 2060978404 = 152902^2 + 45398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (25440000007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1589999993 + ... + 1590000008.

Almost surely, 2^25440000008 is an apocalyptic number.

It is an amenable number.

25440000008 is a deficient number, since it is larger than the sum of its proper divisors (22260000022).

25440000008 is a wasteful number, since it uses less digits than its factorization.

25440000008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3180000007 (or 3180000003 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The spelling of 25440000008 in words is "twenty-five billion, four hundred forty million, eight", and thus it is an aban number.