25478990220 has 24 divisors (see below), whose sum is σ = 71341172784. Its totient is φ = 6794397376.

The previous prime is 25478990219. The next prime is 25478990249. The reversal of 25478990220 is 2209987452.

It is a self number, because there is not a number n which added to its sum of digits gives 25478990220.

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, 212324859 + ... + 212324978.

It is an arithmetic number, because the mean of its divisors is an integer number (2972548866).

Almost surely, 2^25478990220 is an apocalyptic number.

25478990220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25478990220 is an abundant number, since it is smaller than the sum of its proper divisors (45862182564).

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

25478990220 is a wasteful number, since it uses less digits than its factorization.

25478990220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424649849 (or 424649847 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 25478990220 in words is "twenty-five billion, four hundred seventy-eight million, nine hundred ninety thousand, two hundred twenty".