77880613 has 4 divisors (see below), whose sum is σ = 77906880. Its totient is φ = 77854348.

The previous prime is 77880581. The next prime is 77880619. The reversal of 77880613 is 31608877.

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: 31608877 = 23 ⋅1374299.

It is a cyclic number.

It is not a de Polignac number, because 77880613 - 2⁵ = 77880581 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77880619) 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, 8023 + ... + 14836.

It is an arithmetic number, because the mean of its divisors is an integer number (19476720).

Almost surely, 2^77880613 is an apocalyptic number.

It is an amenable number.

77880613 is a deficient number, since it is larger than the sum of its proper divisors (26267).

77880613 is a wasteful number, since it uses less digits than its factorization.

77880613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26266.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 77880613 is about 8824.9993201133. Note that the first 3 decimals coincide. The cubic root of 77880613 is about 427.0477654446.

The spelling of 77880613 in words is "seventy-seven million, eight hundred eighty thousand, six hundred thirteen".