13090640 has 20 divisors (see below), whose sum is σ = 30435924. Its totient is φ = 5236224.

The previous prime is 13090633. The next prime is 13090667. The reversal of 13090640 is 4609031.

It can be written as a sum of positive squares in 2 ways, for example, as 1827904 + 11262736 = 1352^2 + 3356^2 .

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, 81737 + ... + 81896.

Almost surely, 2^13090640 is an apocalyptic number.

13090640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13090640 is an abundant number, since it is smaller than the sum of its proper divisors (17345284).

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

13090640 is a wasteful number, since it uses less digits than its factorization.

13090640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163646 (or 163640 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 13090640 is about 3618.0989483429. The cubic root of 13090640 is about 235.6786779043.

Adding to 13090640 its reverse (4609031), we get a palindrome (17699671).

The spelling of 13090640 in words is "thirteen million, ninety thousand, six hundred forty".