36689661 has 6 divisors (see below), whose sum is σ = 52996190. Its totient is φ = 24459768.

The previous prime is 36689659. The next prime is 36689663. The reversal of 36689661 is 16698663.

It is an interprime number because it is at equal distance from previous prime (36689659) and next prime (36689663).

It can be written as a sum of positive squares in only one way, i.e., 35176761 + 1512900 = 5931^2 + 1230^2 .

It is not a de Polignac number, because 36689661 - 2¹ = 36689659 is a prime.

It is a super-2 number, since 2×36689661² = 2692262448589842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (36689663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2038306 + ... + 2038323.

Almost surely, 2^36689661 is an apocalyptic number.

It is an amenable number.

36689661 is a deficient number, since it is larger than the sum of its proper divisors (16306529).

36689661 is a wasteful number, since it uses less digits than its factorization.

36689661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4076635 (or 4076632 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 36689661 is about 6057.1991051971. The cubic root of 36689661 is about 332.2879300456.

The spelling of 36689661 in words is "thirty-six million, six hundred eighty-nine thousand, six hundred sixty-one".