77812378 has 16 divisors (see below), whose sum is σ = 133513920. Its totient is φ = 33317856.

The previous prime is 77812367. The next prime is 77812411. The reversal of 77812378 is 87321877.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20950 + ... + 24382.

It is an arithmetic number, because the mean of its divisors is an integer number (8344620).

Almost surely, 2^77812378 is an apocalyptic number.

77812378 is a deficient number, since it is larger than the sum of its proper divisors (55701542).

77812378 is a wasteful number, since it uses less digits than its factorization.

77812378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5061.

The product of its digits is 131712, while the sum is 43.

The square root of 77812378 is about 8821.1324669795. The cubic root of 77812378 is about 426.9230098839.

The spelling of 77812378 in words is "seventy-seven million, eight hundred twelve thousand, three hundred seventy-eight".