78216955738 has 32 divisors (see below), whose sum is σ = 123646279680. Its totient is φ = 37036736880.

The previous prime is 78216955721. The next prime is 78216955741. The reversal of 78216955738 is 83755961287.

It is a super-2 number, since 2×78216955738² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2630631 + ... + 2660197.

It is an arithmetic number, because the mean of its divisors is an integer number (3863946240).

Almost surely, 2^78216955738 is an apocalyptic number.

78216955738 is a deficient number, since it is larger than the sum of its proper divisors (45429323942).

78216955738 is a wasteful number, since it uses less digits than its factorization.

78216955738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30162.

The product of its digits is 25401600, while the sum is 61.

The spelling of 78216955738 in words is "seventy-eight billion, two hundred sixteen million, nine hundred fifty-five thousand, seven hundred thirty-eight".