7979773977 has 48 divisors (see below), whose sum is σ = 13516259328. Its totient is φ = 4441620960.

The previous prime is 7979773961. The next prime is 7979774003. The reversal of 7979773977 is 7793779797.

It is not a de Polignac number, because 7979773977 - 2⁴ = 7979773961 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (7979773927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1033702 + ... + 1041392.

It is an arithmetic number, because the mean of its divisors is an integer number (281588736).

Almost surely, 2^7979773977 is an apocalyptic number.

It is an amenable number.

7979773977 is a deficient number, since it is larger than the sum of its proper divisors (5536485351).

7979773977 is a wasteful number, since it uses less digits than its factorization.

7979773977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8130 (or 8127 counting only the distinct ones).

The product of its digits is 257298363, while the sum is 72.

The square root of 7979773977 is about 89329.5806382186. The cubic root of 7979773977 is about 1998.3130756265.

The spelling of 7979773977 in words is "seven billion, nine hundred seventy-nine million, seven hundred seventy-three thousand, nine hundred seventy-seven".