77131782 has 144 divisors (see below), whose sum is σ = 216871200. Its totient is φ = 19686240.

The previous prime is 77131759. The next prime is 77131819. The reversal of 77131782 is 28713177.

It is a happy number.

Its product of digits (16464) is a multiple of the sum of its prime divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2488107 + ... + 2488137.

It is an arithmetic number, because the mean of its divisors is an integer number (1506050).

Almost surely, 2^77131782 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77131782, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108435600).

77131782 is an abundant number, since it is smaller than the sum of its proper divisors (139739418).

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

77131782 is a wasteful number, since it uses less digits than its factorization.

77131782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 56 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 77131782 is about 8782.4701536641. The cubic root of 77131782 is about 425.6746507443.

The spelling of 77131782 in words is "seventy-seven million, one hundred thirty-one thousand, seven hundred eighty-two".