77312671 has 4 divisors (see below), whose sum is σ = 77333200. Its totient is φ = 77292144.

The previous prime is 77312659. The next prime is 77312689. The reversal of 77312671 is 17621377.

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 77312671 - 2¹⁵ = 77279903 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 (77312471) 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, 2811 + ... + 12748.

It is an arithmetic number, because the mean of its divisors is an integer number (19333300).

Almost surely, 2^77312671 is an apocalyptic number.

77312671 is a deficient number, since it is larger than the sum of its proper divisors (20529).

77312671 is a wasteful number, since it uses less digits than its factorization.

77312671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20528.

The product of its digits is 12348, while the sum is 34.

The square root of 77312671 is about 8792.7624214464. The cubic root of 77312671 is about 426.0071541776.

The spelling of 77312671 in words is "seventy-seven million, three hundred twelve thousand, six hundred seventy-one".