77612971 has 4 divisors (see below), whose sum is σ = 80987472. Its totient is φ = 74238472.

The previous prime is 77612957. The next prime is 77612987. The reversal of 77612971 is 17921677.

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

It is a cyclic number.

It is not a de Polignac number, because 77612971 - 2⁹ = 77612459 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 not an unprimeable number, because it can be changed into a prime (77612911) 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, 1687216 + ... + 1687261.

It is an arithmetic number, because the mean of its divisors is an integer number (20246868).

Almost surely, 2^77612971 is an apocalyptic number.

77612971 is a deficient number, since it is larger than the sum of its proper divisors (3374501).

77612971 is a wasteful number, since it uses less digits than its factorization.

77612971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374500.

The product of its digits is 37044, while the sum is 40.

The square root of 77612971 is about 8809.8224159174. The cubic root of 77612971 is about 426.5580111368.

The spelling of 77612971 in words is "seventy-seven million, six hundred twelve thousand, nine hundred seventy-one".