76991865 has 16 divisors (see below), whose sum is σ = 123744768. Its totient is φ = 40876416.

The previous prime is 76991851. The next prime is 76991867. The reversal of 76991865 is 56819967.

It is not a de Polignac number, because 76991865 - 2¹² = 76987769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (76991867) 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, 8164 + ... + 14853.

It is an arithmetic number, because the mean of its divisors is an integer number (7734048).

Almost surely, 2^76991865 is an apocalyptic number.

It is an amenable number.

76991865 is a deficient number, since it is larger than the sum of its proper divisors (46752903).

76991865 is a wasteful number, since it uses less digits than its factorization.

76991865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23248.

The product of its digits is 816480, while the sum is 51.

The square root of 76991865 is about 8774.5008405037. The cubic root of 76991865 is about 425.4171037760.

The spelling of 76991865 in words is "seventy-six million, nine hundred ninety-one thousand, eight hundred sixty-five".