78640742586 has 64 divisors (see below), whose sum is σ = 183577132800. Its totient is φ = 22449369600.

The previous prime is 78640742581. The next prime is 78640742591. The reversal of 78640742586 is 68524704687.

It is an interprime number because it is at equal distance from previous prime (78640742581) and next prime (78640742591).

It is not an unprimeable number, because it can be changed into a prime (78640742581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2455750 + ... + 2487566.

It is an arithmetic number, because the mean of its divisors is an integer number (2868392700).

Almost surely, 2^78640742586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78640742586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91788566400).

78640742586 is an abundant number, since it is smaller than the sum of its proper divisors (104936390214).

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

78640742586 is a wasteful number, since it uses less digits than its factorization.

78640742586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33044 (or 33030 counting only the distinct ones).

The product of its (nonzero) digits is 18063360, while the sum is 57.

The spelling of 78640742586 in words is "seventy-eight billion, six hundred forty million, seven hundred forty-two thousand, five hundred eighty-six".