77539380 has 96 divisors (see below), whose sum is σ = 242040960. Its totient is φ = 18432000.

The previous prime is 77539379. The next prime is 77539387. The reversal of 77539380 is 8393577.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77539387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17380 + ... + 21380.

It is an arithmetic number, because the mean of its divisors is an integer number (2521260).

Almost surely, 2^77539380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77539380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121020480).

77539380 is an abundant number, since it is smaller than the sum of its proper divisors (164501580).

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

77539380 is a wasteful number, since it uses less digits than its factorization.

77539380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049 (or 4047 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 77539380 is about 8805.6447804803. The cubic root of 77539380 is about 426.4231507013.

The spelling of 77539380 in words is "seventy-seven million, five hundred thirty-nine thousand, three hundred eighty".