28917113977 has 16 divisors (see below), whose sum is σ = 30444005520. Its totient is φ = 27438124032.

The previous prime is 28917113971. The next prime is 28917113993. The reversal of 28917113977 is 77931171982.

It can be written as a sum of positive squares in 8 ways, for example, as 1764336016 + 27152777961 = 42004^2 + 164781^2 .

It is a cyclic number.

It is not a de Polignac number, because 28917113977 - 2²⁷ = 28782896249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28917113971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180243 + ... + 300535.

It is an arithmetic number, because the mean of its divisors is an integer number (1902750345).

Almost surely, 2^28917113977 is an apocalyptic number.

It is an amenable number.

28917113977 is a deficient number, since it is larger than the sum of its proper divisors (1526891543).

28917113977 is a wasteful number, since it uses less digits than its factorization.

28917113977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120492.

The product of its digits is 1333584, while the sum is 55.

The spelling of 28917113977 in words is "twenty-eight billion, nine hundred seventeen million, one hundred thirteen thousand, nine hundred seventy-seven".