18272520 has 128 divisors (see below), whose sum is σ = 69638400. Its totient is φ = 4174848.

The previous prime is 18272503. The next prime is 18272537. The reversal of 18272520 is 2527281.

It is an interprime number because it is at equal distance from previous prime (18272503) and next prime (18272537).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6352 + ... + 8768.

It is an arithmetic number, because the mean of its divisors is an integer number (544050).

Almost surely, 2^18272520 is an apocalyptic number.

18272520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18272520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34819200).

18272520 is an abundant number, since it is smaller than the sum of its proper divisors (51365880).

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

18272520 is a wasteful number, since it uses less digits than its factorization.

18272520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2444 (or 2434 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18272520 is about 4274.6368266790. The cubic root of 18272520 is about 263.3901211004.

The spelling of 18272520 in words is "eighteen million, two hundred seventy-two thousand, five hundred twenty".