23061556 has 36 divisors (see below), whose sum is σ = 47469828. Its totient is φ = 9773568.

The previous prime is 23061553. The next prime is 23061559. The reversal of 23061556 is 65516032.

It is an interprime number because it is at equal distance from previous prime (23061553) and next prime (23061559).

It can be written as a sum of positive squares in 2 ways, for example, as 4708900 + 18352656 = 2170^2 + 4284^2 .

It is a super-2 number, since 2×23061556² = 1063670730282272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23061553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18406 + ... + 19618.

Almost surely, 2^23061556 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 23061556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23734914).

23061556 is an abundant number, since it is smaller than the sum of its proper divisors (24408272).

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

23061556 is a wasteful number, since it uses less digits than its factorization.

23061556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1328 (or 1319 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 23061556 is about 4802.2448917147. The cubic root of 23061556 is about 284.6401778930.

Adding to 23061556 its reverse (65516032), we get a palindrome (88577588).

The spelling of 23061556 in words is "twenty-three million, sixty-one thousand, five hundred fifty-six".