76720924577 has 4 divisors (see below), whose sum is σ = 83695554096. Its totient is φ = 69746295060.

The previous prime is 76720924561. The next prime is 76720924591. The reversal of 76720924577 is 77542902767.

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: 77542902767 = 11 ⋅7049354797.

It is a cyclic number.

It is not a de Polignac number, because 76720924577 - 2⁴ = 76720924561 is a prime.

It is a super-2 number, since 2×76720924577² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (76720924547) 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, 3487314743 + ... + 3487314764.

It is an arithmetic number, because the mean of its divisors is an integer number (20923888524).

Almost surely, 2^76720924577 is an apocalyptic number.

It is an amenable number.

76720924577 is a deficient number, since it is larger than the sum of its proper divisors (6974629519).

76720924577 is a wasteful number, since it uses less digits than its factorization.

76720924577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6974629518.

The product of its (nonzero) digits is 10372320, while the sum is 56.

The spelling of 76720924577 in words is "seventy-six billion, seven hundred twenty million, nine hundred twenty-four thousand, five hundred seventy-seven".