76989945 has 16 divisors (see below), whose sum is σ = 123302592. Its totient is φ = 41021760.

The previous prime is 76989937. The next prime is 76989949. The reversal of 76989945 is 54998967.

It is not a de Polignac number, because 76989945 - 2³ = 76989937 is a prime.

It is a super-2 number, since 2×76989945² = 11854903262206050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (76989949) 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, 20515 + ... + 23975.

It is an arithmetic number, because the mean of its divisors is an integer number (7706412).

Almost surely, 2^76989945 is an apocalyptic number.

It is an amenable number.

76989945 is a deficient number, since it is larger than the sum of its proper divisors (46312647).

76989945 is a wasteful number, since it uses less digits than its factorization.

76989945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952.

The product of its digits is 4898880, while the sum is 57.

The square root of 76989945 is about 8774.3914318886. The cubic root of 76989945 is about 425.4135674386.

The spelling of 76989945 in words is "seventy-six million, nine hundred eighty-nine thousand, nine hundred forty-five".