76699661 has 4 divisors (see below), whose sum is σ = 76720092. Its totient is φ = 76679232.

The previous prime is 76699627. The next prime is 76699669. The reversal of 76699661 is 16699667.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49970761 + 26728900 = 7069^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 76699661 - 2²⁶ = 9590797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76699669) 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, 2780 + ... + 12693.

It is an arithmetic number, because the mean of its divisors is an integer number (19180023).

Almost surely, 2^76699661 is an apocalyptic number.

It is an amenable number.

76699661 is a deficient number, since it is larger than the sum of its proper divisors (20431).

76699661 is a wasteful number, since it uses less digits than its factorization.

76699661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20430.

The product of its digits is 734832, while the sum is 50.

The square root of 76699661 is about 8757.8342642459. The cubic root of 76699661 is about 424.8782322434.

The spelling of 76699661 in words is "seventy-six million, six hundred ninety-nine thousand, six hundred sixty-one".