15120640 has 36 divisors (see below), whose sum is σ = 36221724. Its totient is φ = 6047744.

The previous prime is 15120613. The next prime is 15120661. The reversal of 15120640 is 4602151.

It can be written as a sum of positive squares in 2 ways, for example, as 5683456 + 9437184 = 2384^2 + 3072^2 .

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, 4627 + ... + 7186.

It is an arithmetic number, because the mean of its divisors is an integer number (1006159).

Almost surely, 2^15120640 is an apocalyptic number.

15120640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15120640 is an abundant number, since it is smaller than the sum of its proper divisors (21101084).

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

15120640 is an equidigital number, since it uses as much as digits as its factorization.

15120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11834 (or 11820 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 15120640 is about 3888.5267132939. The cubic root of 15120640 is about 247.2806068581.

Adding to 15120640 its reverse (4602151), we get a palindrome (19722791).

The spelling of 15120640 in words is "fifteen million, one hundred twenty thousand, six hundred forty".