77847012 has 72 divisors (see below), whose sum is σ = 210161952. Its totient is φ = 24211200.

The previous prime is 77846963. The next prime is 77847013. The reversal of 77847012 is 21074877.

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

It is not an unprimeable number, because it can be changed into a prime (77847013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79687 + ... + 80657.

It is an arithmetic number, because the mean of its divisors is an integer number (2918916).

Almost surely, 2^77847012 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 77847012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105080976).

77847012 is an abundant number, since it is smaller than the sum of its proper divisors (132314940).

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

77847012 is a wasteful number, since it uses less digits than its factorization.

77847012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 77847012 is about 8823.0953752070. The cubic root of 77847012 is about 426.9863411032.

The spelling of 77847012 in words is "seventy-seven million, eight hundred forty-seven thousand, twelve".