23680781 has 4 divisors (see below), whose sum is σ = 23831772. Its totient is φ = 23529792.

The previous prime is 23680729. The next prime is 23680819. The reversal of 23680781 is 18708632.

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 17355556 + 6325225 = 4166^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 23680781 - 2¹⁴ = 23664397 is a prime.

It is a super-2 number, since 2×23680781² = 1121558777539922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23680721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75260 + ... + 75573.

It is an arithmetic number, because the mean of its divisors is an integer number (5957943).

Almost surely, 2^23680781 is an apocalyptic number.

It is an amenable number.

23680781 is a deficient number, since it is larger than the sum of its proper divisors (150991).

23680781 is a wasteful number, since it uses less digits than its factorization.

23680781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150990.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 23680781 is about 4866.2902708326. The cubic root of 23680781 is about 287.1653310533.

The spelling of 23680781 in words is "twenty-three million, six hundred eighty thousand, seven hundred eighty-one".