78506117240 has 64 divisors (see below), whose sum is σ = 180455299200. Its totient is φ = 30724384768.

The previous prime is 78506117237. The next prime is 78506117243. The reversal of 78506117240 is 4271160587.

It is an interprime number because it is at equal distance from previous prime (78506117237) and next prime (78506117243).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78506117243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9051626 + ... + 9060294.

It is an arithmetic number, because the mean of its divisors is an integer number (2819614050).

Almost surely, 2^78506117240 is an apocalyptic number.

It is an amenable number.

78506117240 is an abundant number, since it is smaller than the sum of its proper divisors (101949181960).

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

78506117240 is a wasteful number, since it uses less digits than its factorization.

78506117240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13544 (or 13540 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 78506117240 in words is "seventy-eight billion, five hundred six million, one hundred seventeen thousand, two hundred forty".