78741381864 has 128 divisors (see below), whose sum is σ = 220510080000. Its totient is φ = 23284952064.

The previous prime is 78741381863. The next prime is 78741381871. The reversal of 78741381864 is 46818314787.

It is a super-2 number, since 2×78741381864² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (78741381863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1517127 + ... + 1568169.

It is an arithmetic number, because the mean of its divisors is an integer number (1722735000).

Almost surely, 2^78741381864 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 78741381864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110255040000).

78741381864 is an abundant number, since it is smaller than the sum of its proper divisors (141768698136).

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

78741381864 is a wasteful number, since it uses less digits than its factorization.

78741381864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51287 (or 51283 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 57.

The spelling of 78741381864 in words is "seventy-eight billion, seven hundred forty-one million, three hundred eighty-one thousand, eight hundred sixty-four".