28178739400 has 96 divisors (see below), whose sum is σ = 75992725440. Its totient is φ = 9517052160.

The previous prime is 28178739359. The next prime is 28178739443. The reversal of 28178739400 is 493787182.

It is a super-2 number, since 2×28178739400² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56407 + ... + 244006.

It is an arithmetic number, because the mean of its divisors is an integer number (791590890).

Almost surely, 2^28178739400 is an apocalyptic number.

28178739400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28178739400 is an abundant number, since it is smaller than the sum of its proper divisors (47813986040).

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

28178739400 is a wasteful number, since it uses less digits than its factorization.

28178739400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300503 (or 300494 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 28178739400 in words is "twenty-eight billion, one hundred seventy-eight million, seven hundred thirty-nine thousand, four hundred".