77987814 has 16 divisors (see below), whose sum is σ = 156230400. Its totient is φ = 25953480.

The previous prime is 77987813. The next prime is 77987821. The reversal of 77987814 is 41878977.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77987813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6514 + ... + 14085.

It is an arithmetic number, because the mean of its divisors is an integer number (9764400).

Almost surely, 2^77987814 is an apocalyptic number.

77987814 is an abundant number, since it is smaller than the sum of its proper divisors (78242586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77987814 is a wasteful number, since it uses less digits than its factorization.

77987814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21235.

The product of its digits is 790272, while the sum is 51.

The square root of 77987814 is about 8831.0709429831. The cubic root of 77987814 is about 427.2436163192.

The spelling of 77987814 in words is "seventy-seven million, nine hundred eighty-seven thousand, eight hundred fourteen".