28921552284 has 12 divisors (see below), whose sum is σ = 67483622024. Its totient is φ = 9640517424.

The previous prime is 28921552273. The next prime is 28921552307. The reversal of 28921552284 is 48225512982.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28921552284² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1205064667 + ... + 1205064690.

Almost surely, 2^28921552284 is an apocalyptic number.

It is an amenable number.

28921552284 is an abundant number, since it is smaller than the sum of its proper divisors (38562069740).

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

28921552284 is a wasteful number, since it uses less digits than its factorization.

28921552284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2410129364 (or 2410129362 counting only the distinct ones).

The product of its digits is 921600, while the sum is 48.

The spelling of 28921552284 in words is "twenty-eight billion, nine hundred twenty-one million, five hundred fifty-two thousand, two hundred eighty-four".