13609578 has 8 divisors (see below), whose sum is σ = 27219168. Its totient is φ = 4536524.

The previous prime is 13609559. The next prime is 13609579. The reversal of 13609578 is 87590631.

It is a sphenic number, since it is the product of 3 distinct primes.

13609578 is an admirable number.

It is a super-2 number, since 2×13609578² = 370441226676168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13609579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1134126 + ... + 1134137.

It is an arithmetic number, because the mean of its divisors is an integer number (3402396).

Almost surely, 2^13609578 is an apocalyptic number.

13609578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

13609578 is a wasteful number, since it uses less digits than its factorization.

13609578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268268.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 13609578 is about 3689.1161543112. The cubic root of 13609578 is about 238.7526604420.

The spelling of 13609578 in words is "thirteen million, six hundred nine thousand, five hundred seventy-eight".