36638281 has 8 divisors (see below), whose sum is σ = 40131720. Its totient is φ = 33293568.

The previous prime is 36638263. The next prime is 36638299. The reversal of 36638281 is 18283663.

It is an interprime number because it is at equal distance from previous prime (36638263) and next prime (36638299).

It can be written as a sum of positive squares in 4 ways, for example, as 10791225 + 25847056 = 3285^2 + 5084^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 36638281 - 2¹⁷ = 36507209 is a prime.

It is a super-2 number, since 2×36638281² = 2684727269269922, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 36638281.

It is not an unprimeable number, because it can be changed into a prime (36638221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36666 + ... + 37651.

It is an arithmetic number, because the mean of its divisors is an integer number (5016465).

Almost surely, 2^36638281 is an apocalyptic number.

It is an amenable number.

36638281 is a deficient number, since it is larger than the sum of its proper divisors (3493439).

36638281 is a wasteful number, since it uses less digits than its factorization.

36638281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74363.

The product of its digits is 41472, while the sum is 37.

The square root of 36638281 is about 6052.9563851064. The cubic root of 36638281 is about 332.1327461853.

It can be divided in two parts, 3663 and 8281, that multiplied together give a palindrome (30333303).

The spelling of 36638281 in words is "thirty-six million, six hundred thirty-eight thousand, two hundred eighty-one".