76640605 has 4 divisors (see below), whose sum is σ = 91968732. Its totient is φ = 61312480.

The previous prime is 76640581. The next prime is 76640647. The reversal of 76640605 is 50604667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50604667 = 109 ⋅464263.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 59151481 = 4182^2 + 7691^2 .

It is not a de Polignac number, because 76640605 - 2⁷ = 76640477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7664056 + ... + 7664065.

It is an arithmetic number, because the mean of its divisors is an integer number (22992183).

Almost surely, 2^76640605 is an apocalyptic number.

It is an amenable number.

76640605 is a deficient number, since it is larger than the sum of its proper divisors (15328127).

76640605 is a wasteful number, since it uses less digits than its factorization.

76640605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15328126.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 76640605 is about 8754.4620051720. The cubic root of 76640605 is about 424.7691572219.

The spelling of 76640605 in words is "seventy-six million, six hundred forty thousand, six hundred five".