77180640 has 96 divisors (see below), whose sum is σ = 253725696. Its totient is φ = 19683840.

The previous prime is 77180591. The next prime is 77180651. The reversal of 77180640 is 4608177.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7545 + ... + 14535.

It is an arithmetic number, because the mean of its divisors is an integer number (2642976).

Almost surely, 2^77180640 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 77180640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126862848).

77180640 is an abundant number, since it is smaller than the sum of its proper divisors (176545056).

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

77180640 is a wasteful number, since it uses less digits than its factorization.

77180640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7032 (or 7024 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 77180640 is about 8785.2512769983. The cubic root of 77180640 is about 425.7645109021.

The spelling of 77180640 in words is "seventy-seven million, one hundred eighty thousand, six hundred forty".