28712993530 has 24 divisors (see below), whose sum is σ = 55964855772. Its totient is φ = 10601720064.

The previous prime is 28712993521. The next prime is 28712993539. The reversal of 28712993530 is 3539921782.

It is an interprime number because it is at equal distance from previous prime (28712993521) and next prime (28712993539).

It can be written as a sum of positive squares in 6 ways, for example, as 29929 + 28712963601 = 173^2 + 169449^2 .

It is not an unprimeable number, because it can be changed into a prime (28712993539) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8493279 + ... + 8496658.

Almost surely, 2^28712993530 is an apocalyptic number.

28712993530 is a deficient number, since it is larger than the sum of its proper divisors (27251862242).

28712993530 is a wasteful number, since it uses less digits than its factorization.

28712993530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16989970 (or 16989957 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 28712993530 in words is "twenty-eight billion, seven hundred twelve million, nine hundred ninety-three thousand, five hundred thirty".