77998392 has 24 divisors (see below), whose sum is σ = 211245840. Its totient is φ = 25999440.

The previous prime is 77998391. The next prime is 77998409. The reversal of 77998392 is 29389977.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77998391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 541584 + ... + 541727.

It is an arithmetic number, because the mean of its divisors is an integer number (8801910).

Almost surely, 2^77998392 is an apocalyptic number.

77998392 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

77998392 is an abundant number, since it is smaller than the sum of its proper divisors (133247448).

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

77998392 is a wasteful number, since it uses less digits than its factorization.

77998392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083323 (or 1083316 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 77998392 is about 8831.6698307851. The cubic root of 77998392 is about 427.2629320662.

The spelling of 77998392 in words is "seventy-seven million, nine hundred ninety-eight thousand, three hundred ninety-two".