78314811840 has 168 divisors, whose sum is σ = 270187417968. Its totient is φ = 20820602880.

The previous prime is 78314811833. The next prime is 78314811847. The reversal of 78314811840 is 4811841387.

It is an interprime number because it is at equal distance from previous prime (78314811833) and next prime (78314811847).

It is a super-2 number, since 2×78314811840² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78314811847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 912204 + ... + 994356.

Almost surely, 2^78314811840 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 78314811840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135093708984).

78314811840 is an abundant number, since it is smaller than the sum of its proper divisors (191872606128).

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

78314811840 is a wasteful number, since it uses less digits than its factorization.

78314811840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82507 (or 82494 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

The spelling of 78314811840 in words is "seventy-eight billion, three hundred fourteen million, eight hundred eleven thousand, eight hundred forty".