23778985 has 8 divisors (see below), whose sum is σ = 29518920. Its totient is φ = 18367104.

The previous prime is 23778983. The next prime is 23778991. The reversal of 23778985 is 58987732.

It can be written as a sum of positive squares in 4 ways, for example, as 71824 + 23707161 = 268^2 + 4869^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23778985 - 2¹ = 23778983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23778983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81852 + ... + 82141.

It is an arithmetic number, because the mean of its divisors is an integer number (3689865).

Almost surely, 2^23778985 is an apocalyptic number.

It is an amenable number.

23778985 is a deficient number, since it is larger than the sum of its proper divisors (5739935).

23778985 is a wasteful number, since it uses less digits than its factorization.

23778985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164027.

The product of its digits is 846720, while the sum is 49.

The square root of 23778985 is about 4876.3700638897. The cubic root of 23778985 is about 287.5617409934.

The spelling of 23778985 in words is "twenty-three million, seven hundred seventy-eight thousand, nine hundred eighty-five".