13015640 has 32 divisors (see below), whose sum is σ = 31948560. Its totient is φ = 4732800.

The previous prime is 13015633. The next prime is 13015643. The reversal of 13015640 is 4651031.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13015643) 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 7 ways as a sum of consecutive naturals, for example, 14351 + ... + 15230.

Almost surely, 2^13015640 is an apocalyptic number.

13015640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13015640 is an abundant number, since it is smaller than the sum of its proper divisors (18932920).

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

13015640 is a wasteful number, since it uses less digits than its factorization.

13015640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29603 (or 29599 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13015640 is about 3607.7195012916. The cubic root of 13015640 is about 235.2277255328.

Adding to 13015640 its reverse (4651031), we get a palindrome (17666671).

The spelling of 13015640 in words is "thirteen million, fifteen thousand, six hundred forty".