13613508 has 30 divisors (see below), whose sum is σ = 35589246. Its totient is φ = 4537728.

The previous prime is 13613507. The next prime is 13613513. The reversal of 13613508 is 80531631.

It can be written as a sum of positive squares in only one way, i.e., 9253764 + 4359744 = 3042^2 + 2088^2 .

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

It is not an unprimeable number, because it can be changed into a prime (13613507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 20685 + ... + 21332.

Almost surely, 2^13613508 is an apocalyptic number.

13613508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13613508 is an abundant number, since it is smaller than the sum of its proper divisors (21975738).

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

13613508 is a wasteful number, since it uses less digits than its factorization.

13613508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42033 (or 42022 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 13613508 is about 3689.6487637714. The cubic root of 13613508 is about 238.7756395443.

The spelling of 13613508 in words is "thirteen million, six hundred thirteen thousand, five hundred eight".