77646963 has 4 divisors (see below), whose sum is σ = 103529288. Its totient is φ = 51764640.

The previous prime is 77646953. The next prime is 77646997. The reversal of 77646963 is 36964677.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36964677 = 3 ⋅12321559.

It is a de Polignac number, because none of the positive numbers 2^k-77646963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77646953) 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, 12941158 + ... + 12941163.

It is an arithmetic number, because the mean of its divisors is an integer number (25882322).

Almost surely, 2^77646963 is an apocalyptic number.

77646963 is a deficient number, since it is larger than the sum of its proper divisors (25882325).

77646963 is a wasteful number, since it uses less digits than its factorization.

77646963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25882324.

The product of its digits is 1143072, while the sum is 48.

The square root of 77646963 is about 8811.7514150139. The cubic root of 77646963 is about 426.6202749717.

The spelling of 77646963 in words is "seventy-seven million, six hundred forty-six thousand, nine hundred sixty-three".