77312070 has 80 divisors (see below), whose sum is σ = 226808208. Its totient is φ = 18740160.

The previous prime is 77312063. The next prime is 77312087. The reversal of 77312070 is 7021377.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4572 + ... + 13248.

Almost surely, 2^77312070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77312070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113404104).

77312070 is an abundant number, since it is smaller than the sum of its proper divisors (149496138).

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

77312070 is a wasteful number, since it uses less digits than its factorization.

77312070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8707 (or 8698 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 77312070 is about 8792.7282455447. The cubic root of 77312070 is about 426.0060503009.

It can be divided in two parts, 7731 and 2070, that added together give a square (9801 = 99²).

The spelling of 77312070 in words is "seventy-seven million, three hundred twelve thousand, seventy".