77440740 has 96 divisors (see below), whose sum is σ = 236065536. Its totient is φ = 18854400.

The previous prime is 77440723. The next prime is 77440799. The reversal of 77440740 is 4704477.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78289 + ... + 79271.

It is an arithmetic number, because the mean of its divisors is an integer number (2459016).

Almost surely, 2^77440740 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 77440740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118032768).

77440740 is an abundant number, since it is smaller than the sum of its proper divisors (158624796).

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

77440740 is a wasteful number, since it uses less digits than its factorization.

77440740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109 (or 1107 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 33.

The square root of 77440740 is about 8800.0420453541. The cubic root of 77440740 is about 426.2422523911.

It can be divided in two parts, 774 and 40740, that added together give a palindrome (41514).

The spelling of 77440740 in words is "seventy-seven million, four hundred forty thousand, seven hundred forty".