13066640 has 40 divisors (see below), whose sum is σ = 30553848. Its totient is φ = 5196800.

The previous prime is 13066633. The next prime is 13066657. The reversal of 13066640 is 4666031.

It can be written as a sum of positive squares in 4 ways, for example, as 1669264 + 11397376 = 1292^2 + 3376^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18290 + ... + 18990.

Almost surely, 2^13066640 is an apocalyptic number.

13066640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13066640 is an abundant number, since it is smaller than the sum of its proper divisors (17487208).

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

13066640 is a wasteful number, since it uses less digits than its factorization.

13066640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947 (or 941 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 13066640 is about 3614.7807679028. The cubic root of 13066640 is about 235.5345609758.

The spelling of 13066640 in words is "thirteen million, sixty-six thousand, six hundred forty".