13640670 has 64 divisors (see below), whose sum is σ = 38304000. Its totient is φ = 3444768.

The previous prime is 13640639. The next prime is 13640677. The reversal of 13640670 is 7604631.

13640670 is a `hidden beast` number, since 13 + 640 + 6 + 7 + 0 = 666.

13640670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640677) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3801 + ... + 6459.

It is an arithmetic number, because the mean of its divisors is an integer number (598500).

Almost surely, 2^13640670 is an apocalyptic number.

13640670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13640670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19152000).

13640670 is an abundant number, since it is smaller than the sum of its proper divisors (24663330).

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

13640670 is a wasteful number, since it uses less digits than its factorization.

13640670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2694 (or 2688 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 13640670 is about 3693.3277677455. The cubic root of 13640670 is about 238.9343376861.

The spelling of 13640670 in words is "thirteen million, six hundred forty thousand, six hundred seventy".