28749031308 has 18 divisors (see below), whose sum is σ = 72671162564. Its totient is φ = 9583010424.

The previous prime is 28749031307. The next prime is 28749031319. The reversal of 28749031308 is 80313094782.

28749031308 is a `hidden beast` number, since 28 + 7 + 490 + 3 + 130 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×28749031308² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28749031307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 399292066 + ... + 399292137.

Almost surely, 2^28749031308 is an apocalyptic number.

It is an amenable number.

28749031308 is an abundant number, since it is smaller than the sum of its proper divisors (43922131256).

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

28749031308 is a wasteful number, since it uses less digits than its factorization.

28749031308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798584213 (or 798584208 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 28749031308 in words is "twenty-eight billion, seven hundred forty-nine million, thirty-one thousand, three hundred eight".