28738997500 has 30 divisors (see below), whose sum is σ = 62846445200. Its totient is φ = 11495598000.

The previous prime is 28738997489. The next prime is 28738997533. The reversal of 28738997500 is 579983782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5745300 + ... + 5750299.

Almost surely, 2^28738997500 is an apocalyptic number.

28738997500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28738997500 is an abundant number, since it is smaller than the sum of its proper divisors (34107447700).

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

28738997500 is a wasteful number, since it uses less digits than its factorization.

28738997500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11495623 (or 11495606 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 28738997500 in words is "twenty-eight billion, seven hundred thirty-eight million, nine hundred ninety-seven thousand, five hundred".