77990761 has 8 divisors (see below), whose sum is σ = 80745984. Its totient is φ = 75250560.

The previous prime is 77990749. The next prime is 77990797. The reversal of 77990761 is 16709977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77990761 - 2¹⁵ = 77957993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77990741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7380 + ... + 14506.

It is an arithmetic number, because the mean of its divisors is an integer number (10093248).

Almost surely, 2^77990761 is an apocalyptic number.

It is an amenable number.

77990761 is a deficient number, since it is larger than the sum of its proper divisors (2755223).

77990761 is a wasteful number, since it uses less digits than its factorization.

77990761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511.

The product of its (nonzero) digits is 166698, while the sum is 46.

The square root of 77990761 is about 8831.2377954622. The cubic root of 77990761 is about 427.2489978056.

The spelling of 77990761 in words is "seventy-seven million, nine hundred ninety thousand, seven hundred sixty-one".