28531425472 has 56 divisors (see below), whose sum is σ = 61987450320. Its totient is φ = 12921922560.

The previous prime is 28531425469. The next prime is 28531425491. The reversal of 28531425472 is 27452413582.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

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, 121854 + ... + 268162.

Almost surely, 2^28531425472 is an apocalyptic number.

28531425472 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28531425472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30993725160).

28531425472 is an abundant number, since it is smaller than the sum of its proper divisors (33456024848).

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

28531425472 is a wasteful number, since it uses less digits than its factorization.

28531425472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146609 (or 146599 counting only the distinct ones).

The product of its digits is 537600, while the sum is 43.

The spelling of 28531425472 in words is "twenty-eight billion, five hundred thirty-one million, four hundred twenty-five thousand, four hundred seventy-two".