77912213 has 4 divisors (see below), whose sum is σ = 78012000. Its totient is φ = 77812428.

The previous prime is 77912209. The next prime is 77912221. The reversal of 77912213 is 31221977.

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 77912213 - 2² = 77912209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77912213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77915213) 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, 48713 + ... + 50286.

It is an arithmetic number, because the mean of its divisors is an integer number (19503000).

Almost surely, 2^77912213 is an apocalyptic number.

It is an amenable number.

77912213 is a deficient number, since it is larger than the sum of its proper divisors (99787).

77912213 is an equidigital number, since it uses as much as digits as its factorization.

77912213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99786.

The product of its digits is 5292, while the sum is 32.

The square root of 77912213 is about 8826.7895069499. The cubic root of 77912213 is about 427.1055157375.

It can be divided in two parts, 77912 and 213, that added together give a 7-th power (78125 = 5⁷).

The spelling of 77912213 in words is "seventy-seven million, nine hundred twelve thousand, two hundred thirteen".