23515280 has 20 divisors (see below), whose sum is σ = 54673212. Its totient is φ = 9406080.

The previous prime is 23515277. The next prime is 23515309. The reversal of 23515280 is 8251532.

It can be written as a sum of positive squares in 2 ways, for example, as 12730624 + 10784656 = 3568^2 + 3284^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146891 + ... + 147050.

Almost surely, 2^23515280 is an apocalyptic number.

23515280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23515280 is an abundant number, since it is smaller than the sum of its proper divisors (31157932).

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

23515280 is a wasteful number, since it uses less digits than its factorization.

23515280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293954 (or 293948 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 23515280 is about 4849.2556129781. The cubic root of 23515280 is about 286.4947830849.

The spelling of 23515280 in words is "twenty-three million, five hundred fifteen thousand, two hundred eighty".