76638671 has 4 divisors (see below), whose sum is σ = 77067000. Its totient is φ = 76210344.

The previous prime is 76638659. The next prime is 76638673. The reversal of 76638671 is 17683667.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17683667 = 541 ⋅32687.

It is a cyclic number.

It is not a de Polignac number, because 76638671 - 2¹⁰ = 76637647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76638673) 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, 213896 + ... + 214253.

It is an arithmetic number, because the mean of its divisors is an integer number (19266750).

Almost surely, 2^76638671 is an apocalyptic number.

76638671 is a deficient number, since it is larger than the sum of its proper divisors (428329).

76638671 is a wasteful number, since it uses less digits than its factorization.

76638671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428328.

The product of its digits is 254016, while the sum is 44.

The square root of 76638671 is about 8754.3515465167. The cubic root of 76638671 is about 424.7655842227.

The spelling of 76638671 in words is "seventy-six million, six hundred thirty-eight thousand, six hundred seventy-one".