78179512890 has 16 divisors (see below), whose sum is σ = 187630831008. Its totient is φ = 20847870096.

The previous prime is 78179512847. The next prime is 78179512903. The reversal of 78179512890 is 9821597187.

It is a super-2 number, since 2×78179512890² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78179512890.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302991852 + ... + 1302991911.

It is an arithmetic number, because the mean of its divisors is an integer number (11726926938).

Almost surely, 2^78179512890 is an apocalyptic number.

78179512890 is an abundant number, since it is smaller than the sum of its proper divisors (109451318118).

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

78179512890 is a wasteful number, since it uses less digits than its factorization.

78179512890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605983773.

The product of its (nonzero) digits is 2540160, while the sum is 57.

The spelling of 78179512890 in words is "seventy-eight billion, one hundred seventy-nine million, five hundred twelve thousand, eight hundred ninety".