78398321233 has 4 divisors (see below), whose sum is σ = 78590004580. Its totient is φ = 78206637888.

The previous prime is 78398321219. The next prime is 78398321263. The reversal of 78398321233 is 33212389387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36730489104 + 41667832129 = 191652^2 + 204127^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78398321233 is a prime.

It is a super-2 number, since 2×78398321233² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78398321263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95841060 + ... + 95841877.

It is an arithmetic number, because the mean of its divisors is an integer number (19647501145).

Almost surely, 2^78398321233 is an apocalyptic number.

It is an amenable number.

78398321233 is a deficient number, since it is larger than the sum of its proper divisors (191683347).

78398321233 is a wasteful number, since it uses less digits than its factorization.

78398321233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191683346.

The product of its digits is 1306368, while the sum is 49.

The spelling of 78398321233 in words is "seventy-eight billion, three hundred ninety-eight million, three hundred twenty-one thousand, two hundred thirty-three".