15106640 has 20 divisors (see below), whose sum is σ = 35123124. Its totient is φ = 6042624.

The previous prime is 15106633. The next prime is 15106661. The reversal of 15106640 is 4660151.

It can be written as a sum of positive squares in 2 ways, for example, as 10679824 + 4426816 = 3268^2 + 2104^2 .

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

It is a congruent number.

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, 94337 + ... + 94496.

Almost surely, 2^15106640 is an apocalyptic number.

15106640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15106640 is an abundant number, since it is smaller than the sum of its proper divisors (20016484).

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

15106640 is a wasteful number, since it uses less digits than its factorization.

15106640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188846 (or 188840 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 15106640 is about 3886.7261287618. The cubic root of 15106640 is about 247.2042653474.

Adding to 15106640 its reverse (4660151), we get a palindrome (19766791).

The spelling of 15106640 in words is "fifteen million, one hundred six thousand, six hundred forty".