78858351690 has 64 divisors (see below), whose sum is σ = 204656730624. Its totient is φ = 19370789888.

The previous prime is 78858351679. The next prime is 78858351721. The reversal of 78858351690 is 9615385887.

It is a super-2 number, since 2×78858351690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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, 1620969 + ... + 1668908.

It is an arithmetic number, because the mean of its divisors is an integer number (3197761416).

Almost surely, 2^78858351690 is an apocalyptic number.

78858351690 is an abundant number, since it is smaller than the sum of its proper divisors (125798378934).

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

78858351690 is a wasteful number, since it uses less digits than its factorization.

78858351690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3289951.

The product of its (nonzero) digits is 14515200, while the sum is 60.

The spelling of 78858351690 in words is "seventy-eight billion, eight hundred fifty-eight million, three hundred fifty-one thousand, six hundred ninety".