23515216 has 20 divisors (see below), whose sum is σ = 48241332. Its totient is φ = 11065856.

The previous prime is 23515213. The next prime is 23515249. The reversal of 23515216 is 61251532.

It can be written as a sum of positive squares in 2 ways, for example, as 10265616 + 13249600 = 3204^2 + 3640^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23515211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42955 + ... + 43498.

Almost surely, 2^23515216 is an apocalyptic number.

It is an amenable number.

23515216 is an abundant number, since it is smaller than the sum of its proper divisors (24726116).

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

23515216 is a wasteful number, since it uses less digits than its factorization.

23515216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86478 (or 86472 counting only the distinct ones).

The product of its digits is 1800, while the sum is 25.

The square root of 23515216 is about 4849.2490140227. The cubic root of 23515216 is about 286.4945231733.

Adding to 23515216 its reverse (61251532), we get a palindrome (84766748).

It can be divided in two parts, 235 and 15216, that added together give a palindrome (15451).

The spelling of 23515216 in words is "twenty-three million, five hundred fifteen thousand, two hundred sixteen".