78146923 has 4 divisors (see below), whose sum is σ = 80259040. Its totient is φ = 76034808.

The previous prime is 78146911. The next prime is 78146941. The reversal of 78146923 is 32964187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32964187 = 43 ⋅766609.

It is a cyclic number.

It is not a de Polignac number, because 78146923 - 2¹⁷ = 78015851 is a prime.

It is a super-2 number, since 2×78146923² = 12213883148735858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78146903) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056003 + ... + 1056076.

It is an arithmetic number, because the mean of its divisors is an integer number (20064760).

Almost surely, 2^78146923 is an apocalyptic number.

78146923 is a deficient number, since it is larger than the sum of its proper divisors (2112117).

78146923 is a wasteful number, since it uses less digits than its factorization.

78146923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2112116.

The product of its digits is 72576, while the sum is 40.

The square root of 78146923 is about 8840.0748300000. The cubic root of 78146923 is about 427.5339699190.

The spelling of 78146923 in words is "seventy-eight million, one hundred forty-six thousand, nine hundred twenty-three".