979780877 has 4 divisors (see below), whose sum is σ = 980436000. Its totient is φ = 979125756.

The previous prime is 979780859. The next prime is 979780883. The reversal of 979780877 is 778087979.

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, and also an emirpimes, since its reverse is a distinct semiprime: 778087979 = 127 ⋅6126677.

It is a cyclic number.

It is not a de Polignac number, because 979780877 - 2⁸ = 979780621 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 (979780897) 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, 325313 + ... + 328310.

It is an arithmetic number, because the mean of its divisors is an integer number (245109000).

Almost surely, 2^979780877 is an apocalyptic number.

It is an amenable number.

979780877 is a deficient number, since it is larger than the sum of its proper divisors (655123).

979780877 is a wasteful number, since it uses less digits than its factorization.

979780877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655122.

The product of its (nonzero) digits is 12446784, while the sum is 62.

The square root of 979780877 is about 31301.4516756012. The cubic root of 979780877 is about 993.2143514556.

The spelling of 979780877 in words is "nine hundred seventy-nine million, seven hundred eighty thousand, eight hundred seventy-seven".