76640447 has 4 divisors (see below), whose sum is σ = 82535880. Its totient is φ = 70745016.

The previous prime is 76640419. The next prime is 76640449. The reversal of 76640447 is 74404667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74404667 = 491 ⋅151537.

It is a cyclic number.

It is not a de Polignac number, because 76640447 - 2⁶ = 76640383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76640447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76640449) 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, 2947697 + ... + 2947722.

It is an arithmetic number, because the mean of its divisors is an integer number (20633970).

Almost surely, 2^76640447 is an apocalyptic number.

76640447 is a deficient number, since it is larger than the sum of its proper divisors (5895433).

76640447 is a wasteful number, since it uses less digits than its factorization.

76640447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5895432.

The product of its (nonzero) digits is 112896, while the sum is 38.

The square root of 76640447 is about 8754.4529811976. The cubic root of 76640447 is about 424.7688653245.

The spelling of 76640447 in words is "seventy-six million, six hundred forty thousand, four hundred forty-seven".