77440536 has 80 divisors (see below), whose sum is σ = 218845440. Its totient is φ = 25583040.

The previous prime is 77440529. The next prime is 77440547. The reversal of 77440536 is 63504477.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 77440536.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 81826 + ... + 82766.

It is an arithmetic number, because the mean of its divisors is an integer number (2735568).

Almost surely, 2^77440536 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 77440536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109422720).

77440536 is an abundant number, since it is smaller than the sum of its proper divisors (141404904).

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

77440536 is a wasteful number, since it uses less digits than its factorization.

77440536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086 (or 1073 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 77440536 is about 8800.0304544928. The cubic root of 77440536 is about 426.2418781114.

The spelling of 77440536 in words is "seventy-seven million, four hundred forty thousand, five hundred thirty-six".