76838665 has 4 divisors (see below), whose sum is σ = 92206404. Its totient is φ = 61470928.

The previous prime is 76838659. The next prime is 76838669. The reversal of 76838665 is 56683867.

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 55160329 + 21678336 = 7427^2 + 4656^2 .

It is a cyclic number.

It is not a de Polignac number, because 76838665 - 2¹³ = 76830473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76838669) 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, 7683862 + ... + 7683871.

It is an arithmetic number, because the mean of its divisors is an integer number (23051601).

Almost surely, 2^76838665 is an apocalyptic number.

It is an amenable number.

76838665 is a deficient number, since it is larger than the sum of its proper divisors (15367739).

76838665 is a wasteful number, since it uses less digits than its factorization.

76838665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15367738.

The product of its digits is 1451520, while the sum is 49.

The square root of 76838665 is about 8765.7666521531. The cubic root of 76838665 is about 425.1347485069.

The spelling of 76838665 in words is "seventy-six million, eight hundred thirty-eight thousand, six hundred sixty-five".