77919912 has 192 divisors, whose sum is σ = 259584000. Its totient is φ = 20621952.

The previous prime is 77919899. The next prime is 77919917. The reversal of 77919912 is 21991977.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (77919917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 756453 + ... + 756555.

It is an arithmetic number, because the mean of its divisors is an integer number (1352000).

Almost surely, 2^77919912 is an apocalyptic number.

77919912 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77919912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129792000).

77919912 is an abundant number, since it is smaller than the sum of its proper divisors (181664088).

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

77919912 is a wasteful number, since it uses less digits than its factorization.

77919912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 213 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 77919912 is about 8827.2256117084. The cubic root of 77919912 is about 427.1195836093.

The spelling of 77919912 in words is "seventy-seven million, nine hundred nineteen thousand, nine hundred twelve".