78285731766 has 64 divisors (see below), whose sum is σ = 176670720000. Its totient is φ = 22911386400.

The previous prime is 78285731753. The next prime is 78285731773. The reversal of 78285731766 is 66713758287.

It is a happy number.

It is a super-2 number, since 2×78285731766² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 982615 + ... + 1059293.

It is an arithmetic number, because the mean of its divisors is an integer number (2760480000).

Almost surely, 2^78285731766 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78285731766, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88335360000).

78285731766 is an abundant number, since it is smaller than the sum of its proper divisors (98384988234).

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

78285731766 is a wasteful number, since it uses less digits than its factorization.

78285731766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77225.

The product of its digits is 23708160, while the sum is 60.

The spelling of 78285731766 in words is "seventy-eight billion, two hundred eighty-five million, seven hundred thirty-one thousand, seven hundred sixty-six".