77972413 has 4 divisors (see below), whose sum is σ = 79070688. Its totient is φ = 76874140.

The previous prime is 77972393. The next prime is 77972423. The reversal of 77972413 is 31427977.

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 77972413 - 2²⁵ = 44417981 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 (77972423) 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, 549031 + ... + 549172.

It is an arithmetic number, because the mean of its divisors is an integer number (19767672).

Almost surely, 2^77972413 is an apocalyptic number.

It is an amenable number.

77972413 is a deficient number, since it is larger than the sum of its proper divisors (1098275).

77972413 is a wasteful number, since it uses less digits than its factorization.

77972413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098274.

The product of its digits is 74088, while the sum is 40.

The square root of 77972413 is about 8830.1989218817. The cubic root of 77972413 is about 427.2154905058.

The spelling of 77972413 in words is "seventy-seven million, nine hundred seventy-two thousand, four hundred thirteen".