77443992 has 64 divisors (see below), whose sum is σ = 216432000. Its totient is φ = 25657632.

The previous prime is 77443991. The next prime is 77443999. The reversal of 77443992 is 29934477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77443991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37663 + ... + 39665.

It is an arithmetic number, because the mean of its divisors is an integer number (3381750).

Almost surely, 2^77443992 is an apocalyptic number.

77443992 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 77443992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108216000).

77443992 is an abundant number, since it is smaller than the sum of its proper divisors (138988008).

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

77443992 is a wasteful number, since it uses less digits than its factorization.

77443992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2197 (or 2187 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 77443992 is about 8800.2268152588. The cubic root of 77443992 is about 426.2482187615.

The spelling of 77443992 in words is "seventy-seven million, four hundred forty-three thousand, nine hundred ninety-two".