77712858 has 64 divisors (see below), whose sum is σ = 177513600. Its totient is φ = 25509168.

The previous prime is 77712857. The next prime is 77712961. The reversal of 77712858 is 85821777.

It is not an unprimeable number, because it can be changed into a prime (77712851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 476685 + ... + 476847.

It is an arithmetic number, because the mean of its divisors is an integer number (2773650).

Almost surely, 2^77712858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77712858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88756800).

77712858 is an abundant number, since it is smaller than the sum of its proper divisors (99800742).

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

77712858 is a wasteful number, since it uses less digits than its factorization.

77712858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 277 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 77712858 is about 8815.4896630874. The cubic root of 77712858 is about 426.7409244397.

The spelling of 77712858 in words is "seventy-seven million, seven hundred twelve thousand, eight hundred fifty-eight".