28424257880 has 32 divisors (see below), whose sum is σ = 63959490000. Its totient is φ = 11368830336.

The previous prime is 28424257861. The next prime is 28424257949. The reversal of 28424257880 is 8875242482.

It is a happy number.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 843434 + ... + 876486.

Almost surely, 2^28424257880 is an apocalyptic number.

28424257880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28424257880 is an abundant number, since it is smaller than the sum of its proper divisors (35535232120).

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

28424257880 is a wasteful number, since it uses less digits than its factorization.

28424257880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54563 (or 54559 counting only the distinct ones).

The product of its (nonzero) digits is 2293760, while the sum is 50.

The spelling of 28424257880 in words is "twenty-eight billion, four hundred twenty-four million, two hundred fifty-seven thousand, eight hundred eighty".