77987312 has 20 divisors (see below), whose sum is σ = 162723960. Its totient is φ = 35994048.

The previous prime is 77987309. The next prime is 77987333. The reversal of 77987312 is 21378977.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187262 + ... + 187677.

It is an arithmetic number, because the mean of its divisors is an integer number (8136198).

Almost surely, 2^77987312 is an apocalyptic number.

It is an amenable number.

77987312 is an abundant number, since it is smaller than the sum of its proper divisors (84736648).

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

77987312 is a wasteful number, since it uses less digits than its factorization.

77987312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374960 (or 374954 counting only the distinct ones).

The product of its digits is 148176, while the sum is 44.

The square root of 77987312 is about 8831.0425205635. The cubic root of 77987312 is about 427.2426996086.

The spelling of 77987312 in words is "seventy-seven million, nine hundred eighty-seven thousand, three hundred twelve".