78421371746 has 16 divisors (see below), whose sum is σ = 118168704576. Its totient is φ = 39031857936.

The previous prime is 78421371709. The next prime is 78421371751. The reversal of 78421371746 is 64717312487.

It is a super-2 number, since 2×78421371746² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78421371694 and 78421371703.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4748315 + ... + 4764801.

It is an arithmetic number, because the mean of its divisors is an integer number (7385544036).

Almost surely, 2^78421371746 is an apocalyptic number.

78421371746 is a deficient number, since it is larger than the sum of its proper divisors (39747332830).

78421371746 is a wasteful number, since it uses less digits than its factorization.

78421371746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27193.

The product of its digits is 1580544, while the sum is 50.

The spelling of 78421371746 in words is "seventy-eight billion, four hundred twenty-one million, three hundred seventy-one thousand, seven hundred forty-six".