8636240 has 40 divisors (see below), whose sum is σ = 20576808. Its totient is φ = 3368960.

The previous prime is 8636239. The next prime is 8636261. The reversal of 8636240 is 426368.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 8456464 = 424^2 + 2908^2 .

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

It is a congruent number.

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, 1964 + ... + 4596.

Almost surely, 2^8636240 is an apocalyptic number.

8636240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8636240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10288404).

8636240 is an abundant number, since it is smaller than the sum of its proper divisors (11940568).

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

8636240 is a wasteful number, since it uses less digits than its factorization.

8636240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687 (or 2681 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 8636240 is about 2938.7480327514. The cubic root of 8636240 is about 205.1673430343.

The spelling of 8636240 in words is "eight million, six hundred thirty-six thousand, two hundred forty".