23155636 has 72 divisors (see below), whose sum is σ = 50459136. Its totient is φ = 9253440.

The previous prime is 23155597. The next prime is 23155637. The reversal of 23155636 is 63655132.

It is a Harshad number since it is a multiple of its sum of digits (31).

Its product of digits (16200) is a multiple of the sum of its prime divisors (180).

It is a junction number, because it is equal to n+sod(n) for n = 23155598 and 23155607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23155637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224761 + ... + 224863.

Almost surely, 2^23155636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23155636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25229568).

23155636 is an abundant number, since it is smaller than the sum of its proper divisors (27303500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23155636 is a wasteful number, since it uses less digits than its factorization.

23155636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 180 counting only the distinct ones).

The product of its digits is 16200, while the sum is 31.

The square root of 23155636 is about 4812.0303407190. The cubic root of 23155636 is about 285.0267175117.

The spelling of 23155636 in words is "twenty-three million, one hundred fifty-five thousand, six hundred thirty-six".