76820665 has 8 divisors (see below), whose sum is σ = 92285568. Its totient is φ = 61389360.

The previous prime is 76820657. The next prime is 76820683. The reversal of 76820665 is 56602867.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 76820665 - 2³ = 76820657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3057 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (11535696).

Almost surely, 2^76820665 is an apocalyptic number.

It is an amenable number.

76820665 is a deficient number, since it is larger than the sum of its proper divisors (15464903).

76820665 is a wasteful number, since it uses less digits than its factorization.

76820665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16799.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 76820665 is about 8764.7398706408. The cubic root of 76820665 is about 425.1015489751.

The spelling of 76820665 in words is "seventy-six million, eight hundred twenty thousand, six hundred sixty-five".