77864078 has 4 divisors (see below), whose sum is σ = 116796120. Its totient is φ = 38932038.

The previous prime is 77864077. The next prime is 77864089. The reversal of 77864078 is 87046877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87046877 = 6971 ⋅12487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77864077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19466018 + ... + 19466021.

It is an arithmetic number, because the mean of its divisors is an integer number (29199030).

Almost surely, 2^77864078 is an apocalyptic number.

77864078 is a deficient number, since it is larger than the sum of its proper divisors (38932042).

77864078 is a wasteful number, since it uses less digits than its factorization.

77864078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38932041.

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 77864078 is about 8824.0624431154. The cubic root of 77864078 is about 427.0175408298.

The spelling of 77864078 in words is "seventy-seven million, eight hundred sixty-four thousand, seventy-eight".