23787661 has 2 divisors, whose sum is σ = 23787662. Its totient is φ = 23787660.

The previous prime is 23787649. The next prime is 23787683. The reversal of 23787661 is 16678732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21799561 + 1988100 = 4669^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 23787661 - 2⁵ = 23787629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23787691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11893830 + 11893831.

It is an arithmetic number, because the mean of its divisors is an integer number (11893831).

Almost surely, 2^23787661 is an apocalyptic number.

It is an amenable number.

23787661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23787661 is an equidigital number, since it uses as much as digits as its factorization.

23787661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 40.

The square root of 23787661 is about 4877.2595789029. The cubic root of 23787661 is about 287.5967099979.

The spelling of 23787661 in words is "twenty-three million, seven hundred eighty-seven thousand, six hundred sixty-one".