28312187904 has 1320 divisors, whose sum is σ = 118065457664. Its totient is φ = 6569164800.

The previous prime is 28312187867. The next prime is 28312187921. The reversal of 28312187904 is 40978121382.

It is a happy number.

It is a super-2 number, since 2×28312187904² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28312187904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 913296369 + ... + 913296399.

Almost surely, 2^28312187904 is an apocalyptic number.

28312187904 is a gapful number since it is divisible by the number (24) 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 28312187904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59032728832).

28312187904 is an abundant number, since it is smaller than the sum of its proper divisors (89753269760).

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

28312187904 is a wasteful number, since it uses less digits than its factorization.

28312187904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 28312187904 in words is "twenty-eight billion, three hundred twelve million, one hundred eighty-seven thousand, nine hundred four".