76646399 has 4 divisors (see below), whose sum is σ = 80680440. Its totient is φ = 72612360.

The previous prime is 76646389. The next prime is 76646429. The reversal of 76646399 is 99364667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99364667 = 313 ⋅317459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76646399 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 (76646329) 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, 2016992 + ... + 2017029.

It is an arithmetic number, because the mean of its divisors is an integer number (20170110).

Almost surely, 2^76646399 is an apocalyptic number.

76646399 is a deficient number, since it is larger than the sum of its proper divisors (4034041).

76646399 is a wasteful number, since it uses less digits than its factorization.

76646399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034040.

The product of its digits is 1469664, while the sum is 50.

The square root of 76646399 is about 8754.7929158833. The cubic root of 76646399 is about 424.7798610800.

The spelling of 76646399 in words is "seventy-six million, six hundred forty-six thousand, three hundred ninety-nine".