7977639743 has 4 divisors (see below), whose sum is σ = 7990914288. Its totient is φ = 7964365200.

The previous prime is 7977639731. The next prime is 7977639749. The reversal of 7977639743 is 3479367797.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7977639743 - 2¹⁰ = 7977638719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7977639749) 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, 6636371 + ... + 6637572.

It is an arithmetic number, because the mean of its divisors is an integer number (1997728572).

Almost surely, 2^7977639743 is an apocalyptic number.

7977639743 is a deficient number, since it is larger than the sum of its proper divisors (13274545).

7977639743 is a wasteful number, since it uses less digits than its factorization.

7977639743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13274544.

The product of its digits is 42007896, while the sum is 62.

The square root of 7977639743 is about 89317.6339979962. The cubic root of 7977639743 is about 1998.1349065038.

The spelling of 7977639743 in words is "seven billion, nine hundred seventy-seven million, six hundred thirty-nine thousand, seven hundred forty-three".