76121665 has 16 divisors (see below), whose sum is σ = 100057680. Its totient is φ = 55336960.

The previous prime is 76121663. The next prime is 76121671. The reversal of 76121665 is 56612167.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 11029041 + 65092624 = 3321^2 + 8068^2 .

It is not a de Polignac number, because 76121665 - 2¹ = 76121663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76121665.

It is not an unprimeable number, because it can be changed into a prime (76121663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12976 + ... + 17905.

It is an arithmetic number, because the mean of its divisors is an integer number (6253605).

Almost surely, 2^76121665 is an apocalyptic number.

It is an amenable number.

76121665 is a deficient number, since it is larger than the sum of its proper divisors (23936015).

76121665 is a wasteful number, since it uses less digits than its factorization.

76121665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30932.

The product of its digits is 15120, while the sum is 34.

The square root of 76121665 is about 8724.7730629513. The cubic root of 76121665 is about 423.8082692674.

The spelling of 76121665 in words is "seventy-six million, one hundred twenty-one thousand, six hundred sixty-five".