78977231 has 4 divisors (see below), whose sum is σ = 78998832. Its totient is φ = 78955632.

The previous prime is 78977209. The next prime is 78977233. The reversal of 78977231 is 13277987.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78977231 is a prime.

It is a super-2 number, since 2×78977231² = 12474806032854722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78977233) 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, 3806 + ... + 13131.

It is an arithmetic number, because the mean of its divisors is an integer number (19749708).

Almost surely, 2^78977231 is an apocalyptic number.

78977231 is a deficient number, since it is larger than the sum of its proper divisors (21601).

78977231 is a wasteful number, since it uses less digits than its factorization.

78977231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21600.

The product of its digits is 148176, while the sum is 44.

The square root of 78977231 is about 8886.9134686909. The cubic root of 78977231 is about 429.0428158954.

The spelling of 78977231 in words is "seventy-eight million, nine hundred seventy-seven thousand, two hundred thirty-one".