13640788 has 48 divisors (see below), whose sum is σ = 28667520. Its totient is φ = 5556096.

The previous prime is 13640777. The next prime is 13640791. The reversal of 13640788 is 88704631.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86806 + ... + 86962.

It is an arithmetic number, because the mean of its divisors is an integer number (597240).

Almost surely, 2^13640788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13640788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14333760).

13640788 is an abundant number, since it is smaller than the sum of its proper divisors (15026732).

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

13640788 is a wasteful number, since it uses less digits than its factorization.

13640788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 302 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 13640788 is about 3693.3437424643. The cubic root of 13640788 is about 238.9350266594.

The spelling of 13640788 in words is "thirteen million, six hundred forty thousand, seven hundred eighty-eight".