7977613993 has 8 divisors (see below), whose sum is σ = 8196180480. Its totient is φ = 7759203120.

The previous prime is 7977613957. The next prime is 7977614003. The reversal of 7977613993 is 3993167797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7977613993 - 2²⁵ = 7944059561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7977613913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69078 + ... + 143968.

It is an arithmetic number, because the mean of its divisors is an integer number (1024522560).

Almost surely, 2^7977613993 is an apocalyptic number.

It is an amenable number.

7977613993 is a deficient number, since it is larger than the sum of its proper divisors (218566487).

7977613993 is a wasteful number, since it uses less digits than its factorization.

7977613993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77807.

The product of its digits is 13502538, while the sum is 61.

The square root of 7977613993 is about 89317.4898494130. The cubic root of 7977613993 is about 1998.1327566603.

The spelling of 7977613993 in words is "seven billion, nine hundred seventy-seven million, six hundred thirteen thousand, nine hundred ninety-three".