23078781 has 24 divisors (see below), whose sum is σ = 36706176. Its totient is φ = 13856640.

The previous prime is 23078761. The next prime is 23078789. The reversal of 23078781 is 18787032.

It is not a de Polignac number, because 23078781 - 2⁶ = 23078717 is a prime.

It is a super-2 number, since 2×23078781² = 1065260264891922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23078789) 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 23 ways as a sum of consecutive naturals, for example, 10156 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (1529424).

Almost surely, 2^23078781 is an apocalyptic number.

It is an amenable number.

23078781 is a deficient number, since it is larger than the sum of its proper divisors (13627395).

23078781 is a wasteful number, since it uses less digits than its factorization.

23078781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193 (or 2190 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 23078781 is about 4804.0379890255. The cubic root of 23078781 is about 284.7110275049.

The spelling of 23078781 in words is "twenty-three million, seventy-eight thousand, seven hundred eighty-one".