77638894 has 8 divisors (see below), whose sum is σ = 116535888. Its totient is φ = 38793600.

The previous prime is 77638843. The next prime is 77638903. The reversal of 77638894 is 49883677.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8922 + ... + 15325.

It is an arithmetic number, because the mean of its divisors is an integer number (14566986).

Almost surely, 2^77638894 is an apocalyptic number.

77638894 is a deficient number, since it is larger than the sum of its proper divisors (38896994).

77638894 is a wasteful number, since it uses less digits than its factorization.

77638894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25850.

The product of its digits is 2032128, while the sum is 52.

The square root of 77638894 is about 8811.2935486227. The cubic root of 77638894 is about 426.6054964661.

The spelling of 77638894 in words is "seventy-seven million, six hundred thirty-eight thousand, eight hundred ninety-four".