28776658957 has 2 divisors, whose sum is σ = 28776658958. Its totient is φ = 28776658956.

The previous prime is 28776658921. The next prime is 28776659003. The reversal of 28776658957 is 75985667782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28321860681 + 454798276 = 168291^2 + 21326^2 .

It is a cyclic number.

It is not a de Polignac number, because 28776658957 - 2²⁷ = 28642441229 is a prime.

It is a super-2 number, since 2×28776658957² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28776688957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14388329478 + 14388329479.

It is an arithmetic number, because the mean of its divisors is an integer number (14388329479).

Almost surely, 2^28776658957 is an apocalyptic number.

It is an amenable number.

28776658957 is a deficient number, since it is larger than the sum of its proper divisors (1).

28776658957 is an equidigital number, since it uses as much as digits as its factorization.

28776658957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 355622400, while the sum is 70.

The spelling of 28776658957 in words is "twenty-eight billion, seven hundred seventy-six million, six hundred fifty-eight thousand, nine hundred fifty-seven".