77310661 has 4 divisors (see below), whose sum is σ = 77344992. Its totient is φ = 77276332.

The previous prime is 77310647. The next prime is 77310671. The reversal of 77310661 is 16601377.

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 a de Polignac number, because none of the positive numbers 2^k-77310661 is a prime.

It is a Smith number, since the sum of its digits (31) 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 (77310671) 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, 13531 + ... + 18376.

It is an arithmetic number, because the mean of its divisors is an integer number (19336248).

Almost surely, 2^77310661 is an apocalyptic number.

It is an amenable number.

77310661 is a deficient number, since it is larger than the sum of its proper divisors (34331).

77310661 is a wasteful number, since it uses less digits than its factorization.

77310661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34330.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 77310661 is about 8792.6481221530. The cubic root of 77310661 is about 426.0034623213.

The spelling of 77310661 in words is "seventy-seven million, three hundred ten thousand, six hundred sixty-one".