77311836 has 144 divisors (see below), whose sum is σ = 239599360. Its totient is φ = 20528640.

The previous prime is 77311823. The next prime is 77311837. The reversal of 77311836 is 63811377.

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 77311836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77311837) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 320676 + ... + 320916.

Almost surely, 2^77311836 is an apocalyptic number.

77311836 is a gapful number since it is divisible by the number (76) 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 77311836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119799680).

77311836 is an abundant number, since it is smaller than the sum of its proper divisors (162287524).

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

77311836 is a wasteful number, since it uses less digits than its factorization.

77311836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 339 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 77311836 is about 8792.7149390845. The cubic root of 77311836 is about 426.0056205038.

The spelling of 77311836 in words is "seventy-seven million, three hundred eleven thousand, eight hundred thirty-six".