78192644890 has 16 divisors (see below), whose sum is σ = 140750592840. Its totient is φ = 31276206400.

The previous prime is 78192644879. The next prime is 78192644891. The reversal of 78192644890 is 9844629187.

It can be written as a sum of positive squares in 4 ways, for example, as 77367978801 + 824666089 = 278151^2 + 28717^2 .

It is a super-2 number, since 2×78192644890² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78192644891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389040 + ... + 554740.

Almost surely, 2^78192644890 is an apocalyptic number.

78192644890 is a deficient number, since it is larger than the sum of its proper divisors (62557947950).

78192644890 is a wasteful number, since it uses less digits than its factorization.

78192644890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212897.

The product of its (nonzero) digits is 6967296, while the sum is 58.

The spelling of 78192644890 in words is "seventy-eight billion, one hundred ninety-two million, six hundred forty-four thousand, eight hundred ninety".