77999012 has 24 divisors (see below), whose sum is σ = 167998656. Its totient is φ = 30856608.

The previous prime is 77999011. The next prime is 77999021. The reversal of 77999012 is 21099977.

It is a super-2 number, since 2×77999012² = 12167691745952288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77999011) 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, 106778 + ... + 107505.

It is an arithmetic number, because the mean of its divisors is an integer number (6999944).

Almost surely, 2^77999012 is an apocalyptic number.

It is an amenable number.

77999012 is an abundant number, since it is smaller than the sum of its proper divisors (89999644).

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

77999012 is a wasteful number, since it uses less digits than its factorization.

77999012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214307 (or 214305 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 77999012 is about 8831.7049316652. The cubic root of 77999012 is about 427.2640641507.

The spelling of 77999012 in words is "seventy-seven million, nine hundred ninety-nine thousand, twelve".