76664443 has 4 divisors (see below), whose sum is σ = 76684320. Its totient is φ = 76644568.

The previous prime is 76664437. The next prime is 76664453. The reversal of 76664443 is 34446667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34446667 = 37 ⋅930991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76664443 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 76664396 and 76664405.

It is not an unprimeable number, because it can be changed into a prime (76664453) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083 + ... + 12556.

It is an arithmetic number, because the mean of its divisors is an integer number (19171080).

Almost surely, 2^76664443 is an apocalyptic number.

76664443 is a deficient number, since it is larger than the sum of its proper divisors (19877).

76664443 is a wasteful number, since it uses less digits than its factorization.

76664443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19876.

The product of its digits is 290304, while the sum is 40.

The square root of 76664443 is about 8755.8233764735. The cubic root of 76664443 is about 424.8131921802.

The spelling of 76664443 in words is "seventy-six million, six hundred sixty-four thousand, four hundred forty-three".