798977861 has 4 divisors (see below), whose sum is σ = 871612224. Its totient is φ = 726343500.

The previous prime is 798977857. The next prime is 798977923. The reversal of 798977861 is 168779897.

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 798977861 - 2² = 798977857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 798977794 and 798977803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (798977161) 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, 36317165 + ... + 36317186.

It is an arithmetic number, because the mean of its divisors is an integer number (217903056).

Almost surely, 2^798977861 is an apocalyptic number.

It is an amenable number.

798977861 is a deficient number, since it is larger than the sum of its proper divisors (72634363).

798977861 is a wasteful number, since it uses less digits than its factorization.

798977861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72634362.

The product of its digits is 10668672, while the sum is 62.

The square root of 798977861 is about 28266.1964367334. The cubic root of 798977861 is about 927.9222358075.

The spelling of 798977861 in words is "seven hundred ninety-eight million, nine hundred seventy-seven thousand, eight hundred sixty-one".