78312748269 has 36 divisors (see below), whose sum is σ = 121019944416. Its totient is φ = 44126525664.

The previous prime is 78312748259. The next prime is 78312748279. The reversal of 78312748269 is 96284721387.

It is an interprime number because it is at equal distance from previous prime (78312748259) and next prime (78312748279).

It is not a de Polignac number, because 78312748269 - 2⁴ = 78312748253 is a prime.

It is a super-2 number, since 2×78312748269² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78312748259) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 101309767 + ... + 101310539.

Almost surely, 2^78312748269 is an apocalyptic number.

78312748269 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

78312748269 is a deficient number, since it is larger than the sum of its proper divisors (42707196147).

78312748269 is an frugal number, since it uses more digits than its factorization.

78312748269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714 (or 862 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 57.

The spelling of 78312748269 in words is "seventy-eight billion, three hundred twelve million, seven hundred forty-eight thousand, two hundred sixty-nine".