78238911660 has 576 divisors, whose sum is σ = 287712681984. Its totient is φ = 15543290880.

The previous prime is 78238911563. The next prime is 78238911661. The reversal of 78238911660 is 6611983287.

It is a super-2 number, since 2×78238911660² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78238911661) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2114565162 + ... + 2114565198.

It is an arithmetic number, because the mean of its divisors is an integer number (499501184).

Almost surely, 2^78238911660 is an apocalyptic number.

78238911660 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78238911660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (143856340992).

78238911660 is an abundant number, since it is smaller than the sum of its proper divisors (209473770324).

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

78238911660 is a wasteful number, since it uses less digits than its factorization.

78238911660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 78238911660 in words is "seventy-eight billion, two hundred thirty-eight million, nine hundred eleven thousand, six hundred sixty".