15090640 has 20 divisors (see below), whose sum is σ = 35085924. Its totient is φ = 6036224.

The previous prime is 15090629. The next prime is 15090641. The reversal of 15090640 is 4609051.

It can be written as a sum of positive squares in 2 ways, for example, as 5702544 + 9388096 = 2388^2 + 3064^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15090641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94237 + ... + 94396.

Almost surely, 2^15090640 is an apocalyptic number.

15090640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15090640 is an abundant number, since it is smaller than the sum of its proper divisors (19995284).

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

15090640 is a wasteful number, since it uses less digits than its factorization.

15090640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188646 (or 188640 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 15090640 is about 3884.6672959212. The cubic root of 15090640 is about 247.1169601303.

Adding to 15090640 its reverse (4609051), we get a palindrome (19699691).

The spelling of 15090640 in words is "fifteen million, ninety thousand, six hundred forty".