23161864 has 32 divisors (see below), whose sum is σ = 48486240. Its totient is φ = 10281600.

The previous prime is 23161861. The next prime is 23161877. The reversal of 23161864 is 46816132.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (23161861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (1515195).

Almost surely, 2^23161864 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 23161864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24243120).

23161864 is an abundant number, since it is smaller than the sum of its proper divisors (25324376).

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

23161864 is a wasteful number, since it uses less digits than its factorization.

23161864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181 (or 6177 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 23161864 is about 4812.6774253008. The cubic root of 23161864 is about 285.0522690631.

Adding to 23161864 its reverse (46816132), we get a palindrome (69977996).

It can be divided in two parts, 23161 and 864, that added together give a square (24025 = 155²).

The spelling of 23161864 in words is "twenty-three million, one hundred sixty-one thousand, eight hundred sixty-four".