37689661 has 4 divisors (see below), whose sum is σ = 37762524. Its totient is φ = 37616800.

The previous prime is 37689637. The next prime is 37689667. The reversal of 37689661 is 16698673.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16698673 = 1879 ⋅8887.

It can be written as a sum of positive squares in 2 ways, for example, as 22982436 + 14707225 = 4794^2 + 3835^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37689661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37689667) 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, 35650 + ... + 36691.

It is an arithmetic number, because the mean of its divisors is an integer number (9440631).

Almost surely, 2^37689661 is an apocalyptic number.

It is an amenable number.

37689661 is a deficient number, since it is larger than the sum of its proper divisors (72863).

37689661 is an equidigital number, since it uses as much as digits as its factorization.

37689661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72862.

The product of its digits is 326592, while the sum is 46.

The square root of 37689661 is about 6139.1905818275. The cubic root of 37689661 is about 335.2798167052.

The spelling of 37689661 in words is "thirty-seven million, six hundred eighty-nine thousand, six hundred sixty-one".