78215775770736 has 120 divisors (see below), whose sum is σ = 224106137340800. Its totient is φ = 25451957801088.

The previous prime is 78215775770719. The next prime is 78215775770791. The reversal of 78215775770736 is 63707757751287.

78215775770736 is a `hidden beast` number, since 7 + 8 + 2 + 15 + 7 + 7 + 577 + 0 + 7 + 36 = 666.

It is a super-2 number, since 2×78215775770736² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8177565 + ... + 14943363.

Almost surely, 2^{78215775770736} 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 78215775770736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112053068670400).

78215775770736 is an abundant number, since it is smaller than the sum of its proper divisors (145890361570064).

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

78215775770736 is a wasteful number, since it uses less digits than its factorization.

78215775770736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6767723 (or 6767714 counting only the distinct ones).

The product of its (nonzero) digits is 847072800, while the sum is 72.

The spelling of 78215775770736 in words is "seventy-eight trillion, two hundred fifteen billion, seven hundred seventy-five million, seven hundred seventy thousand, seven hundred thirty-six".