77215712 has 48 divisors (see below), whose sum is σ = 175506912. Its totient is φ = 32755200.

The previous prime is 77215703. The next prime is 77215727. The reversal of 77215712 is 21751277.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20918 + ... + 24330.

It is an arithmetic number, because the mean of its divisors is an integer number (3656394).

Almost surely, 2^77215712 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 77215712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87753456).

77215712 is an abundant number, since it is smaller than the sum of its proper divisors (98291200).

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

77215712 is a wasteful number, since it uses less digits than its factorization.

77215712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3531 (or 3523 counting only the distinct ones).

The product of its digits is 6860, while the sum is 32.

The square root of 77215712 is about 8787.2471229618. The cubic root of 77215712 is about 425.8289923216.

Adding to 77215712 its reverse (21751277), we get a palindrome (98966989).

The spelling of 77215712 in words is "seventy-seven million, two hundred fifteen thousand, seven hundred twelve".