77647312 has 40 divisors (see below), whose sum is σ = 159529472. Its totient is φ = 36547200.

The previous prime is 77647309. The next prime is 77647321. The reversal of 77647312 is 21374677.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16237 + ... + 20467.

Almost surely, 2^77647312 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 77647312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79764736).

77647312 is an abundant number, since it is smaller than the sum of its proper divisors (81882160).

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

77647312 is a wasteful number, since it uses less digits than its factorization.

77647312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4307 (or 4301 counting only the distinct ones).

The product of its digits is 49392, while the sum is 37.

The square root of 77647312 is about 8811.7712180923. The cubic root of 77647312 is about 426.6209141478.

The spelling of 77647312 in words is "seventy-seven million, six hundred forty-seven thousand, three hundred twelve".