76643953 has 4 divisors (see below), whose sum is σ = 76668928. Its totient is φ = 76618980.

The previous prime is 76643947. The next prime is 76643969. The reversal of 76643953 is 35934667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76643953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76643653) 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, 7113 + ... + 14278.

It is an arithmetic number, because the mean of its divisors is an integer number (19167232).

Almost surely, 2^76643953 is an apocalyptic number.

It is an amenable number.

76643953 is a deficient number, since it is larger than the sum of its proper divisors (24975).

76643953 is a wasteful number, since it uses less digits than its factorization.

76643953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24974.

The product of its digits is 408240, while the sum is 43.

The square root of 76643953 is about 8754.6532198597. The cubic root of 76643953 is about 424.7753423959.

The spelling of 76643953 in words is "seventy-six million, six hundred forty-three thousand, nine hundred fifty-three".