76720861 has 4 divisors (see below), whose sum is σ = 87680992. Its totient is φ = 65760732.

The previous prime is 76720817. The next prime is 76720867. The reversal of 76720861 is 16802767.

It is a happy number.

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: 16802767 = 227 ⋅74021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76720861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76720861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76720867) 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, 5480055 + ... + 5480068.

It is an arithmetic number, because the mean of its divisors is an integer number (21920248).

Almost surely, 2^76720861 is an apocalyptic number.

It is an amenable number.

76720861 is a deficient number, since it is larger than the sum of its proper divisors (10960131).

76720861 is a wasteful number, since it uses less digits than its factorization.

76720861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10960130.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 76720861 is about 8759.0445255176. The cubic root of 76720861 is about 424.9173744797.

The spelling of 76720861 in words is "seventy-six million, seven hundred twenty thousand, eight hundred sixty-one".