23090657 has 4 divisors (see below), whose sum is σ = 23105796. Its totient is φ = 23075520.

The previous prime is 23090647. The next prime is 23090663. The reversal of 23090657 is 75609032.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12952801 + 10137856 = 3599^2 + 3184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23090657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23090647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4988 + ... + 8429.

It is an arithmetic number, because the mean of its divisors is an integer number (5776449).

Almost surely, 2^23090657 is an apocalyptic number.

It is an amenable number.

23090657 is a deficient number, since it is larger than the sum of its proper divisors (15139).

23090657 is a wasteful number, since it uses less digits than its factorization.

23090657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15138.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 23090657 is about 4805.2738735685. The cubic root of 23090657 is about 284.7598551611.

Adding to 23090657 its reverse (75609032), we get a palindrome (98699689).

The spelling of 23090657 in words is "twenty-three million, ninety thousand, six hundred fifty-seven".