78137023 has 4 divisors (see below), whose sum is σ = 78172120. Its totient is φ = 78101928.

The previous prime is 78137011. The next prime is 78137027. The reversal of 78137023 is 32073187.

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

It is a cyclic number.

It is not a de Polignac number, because 78137023 - 2²⁵ = 44582591 is a prime.

It is a super-2 number, since 2×78137023² = 12210788726605058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78137027) 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, 13965 + ... + 18742.

It is an arithmetic number, because the mean of its divisors is an integer number (19543030).

Almost surely, 2^78137023 is an apocalyptic number.

78137023 is a deficient number, since it is larger than the sum of its proper divisors (35097).

78137023 is a wasteful number, since it uses less digits than its factorization.

78137023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35096.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 78137023 is about 8839.5148622535. The cubic root of 78137023 is about 427.5159151878.

The spelling of 78137023 in words is "seventy-eight million, one hundred thirty-seven thousand, twenty-three".