78213023 has 4 divisors (see below), whose sum is σ = 89386320. Its totient is φ = 67039728.

The previous prime is 78213011. The next prime is 78213049. The reversal of 78213023 is 32031287.

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

It is not a de Polignac number, because 78213023 - 2⁴ = 78213007 is a prime.

It is a super-2 number, since 2×78213023² = 12234553933597058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78212983 and 78213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78213623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5586638 + ... + 5586651.

It is an arithmetic number, because the mean of its divisors is an integer number (22346580).

Almost surely, 2^78213023 is an apocalyptic number.

78213023 is a deficient number, since it is larger than the sum of its proper divisors (11173297).

78213023 is a wasteful number, since it uses less digits than its factorization.

78213023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11173296.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 78213023 is about 8843.8126958908. The cubic root of 78213023 is about 427.6544781029.

The spelling of 78213023 in words is "seventy-eight million, two hundred thirteen thousand, twenty-three".