78320023 has 4 divisors (see below), whose sum is σ = 78891840. Its totient is φ = 77748208.

The previous prime is 78320017. The next prime is 78320057. The reversal of 78320023 is 32002387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32002387 = 139 ⋅230233.

It is a cyclic number.

It is not a de Polignac number, because 78320023 - 2⁹ = 78319511 is a prime.

It is a super-2 number, since 2×78320023² = 12268052005441058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78320023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78320323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285703 + ... + 285976.

It is an arithmetic number, because the mean of its divisors is an integer number (19722960).

Almost surely, 2^78320023 is an apocalyptic number.

78320023 is a deficient number, since it is larger than the sum of its proper divisors (571817).

78320023 is a wasteful number, since it uses less digits than its factorization.

78320023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571816.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 78320023 is about 8849.8600553907. The cubic root of 78320023 is about 427.8494080359.

The spelling of 78320023 in words is "seventy-eight million, three hundred twenty thousand, twenty-three".