15228540 has 48 divisors (see below), whose sum is σ = 47379360. Its totient is φ = 4060800.

The previous prime is 15228511. The next prime is 15228547. The reversal of 15228540 is 4582251.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15228547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13561 + ... + 14640.

It is an arithmetic number, because the mean of its divisors is an integer number (987070).

Almost surely, 2^15228540 is an apocalyptic number.

15228540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15228540 is an abundant number, since it is smaller than the sum of its proper divisors (32150820).

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

15228540 is a wasteful number, since it uses less digits than its factorization.

15228540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28219 (or 28211 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 15228540 is about 3902.3761991894. The cubic root of 15228540 is about 247.8674065755.

The spelling of 15228540 in words is "fifteen million, two hundred twenty-eight thousand, five hundred forty".