15622240 has 48 divisors (see below), whose sum is σ = 37149840. Its totient is φ = 6208000.

The previous prime is 15622231. The next prime is 15622241. The reversal of 15622240 is 4222651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15622241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39966 + ... + 40354.

It is an arithmetic number, because the mean of its divisors is an integer number (773955).

It is a vampire number, since it can be written as 2510 ⋅ 6224 (with its own digits).

Almost surely, 2^15622240 is an apocalyptic number.

15622240 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 15622240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18574920).

15622240 is an abundant number, since it is smaller than the sum of its proper divisors (21527600).

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

15622240 is a wasteful number, since it uses less digits than its factorization.

15622240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 647 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 15622240 is about 3952.4979443385. The cubic root of 15622240 is about 249.9852791332.

Adding to 15622240 its reverse (4222651), we get a palindrome (19844891).

The spelling of 15622240 in words is "fifteen million, six hundred twenty-two thousand, two hundred forty".