23280390 has 72 divisors (see below), whose sum is σ = 70424640. Its totient is φ = 5320224.

The previous prime is 23280379. The next prime is 23280427. The reversal of 23280390 is 9308232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1771 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (978120).

Almost surely, 2^23280390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23280390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35212320).

23280390 is an abundant number, since it is smaller than the sum of its proper divisors (47144250).

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

23280390 is a wasteful number, since it uses less digits than its factorization.

23280390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5306 (or 5296 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 23280390 is about 4824.9756476069. The cubic root of 23280390 is about 285.5376738275.

The spelling of 23280390 in words is "twenty-three million, two hundred eighty thousand, three hundred ninety".