28707977113 has 4 divisors (see below), whose sum is σ = 28719886608. Its totient is φ = 28696067620.

The previous prime is 28707977107. The next prime is 28707977131. The reversal of 28707977113 is 31177970782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28707977113 - 2²⁵ = 28674422681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28707977143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5951131 + ... + 5955952.

It is an arithmetic number, because the mean of its divisors is an integer number (7179971652).

Almost surely, 2^28707977113 is an apocalyptic number.

It is an amenable number.

28707977113 is a deficient number, since it is larger than the sum of its proper divisors (11909495).

28707977113 is a wasteful number, since it uses less digits than its factorization.

28707977113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11909494.

The product of its (nonzero) digits is 1037232, while the sum is 52.

The spelling of 28707977113 in words is "twenty-eight billion, seven hundred seven million, nine hundred seventy-seven thousand, one hundred thirteen".