263423690 has 8 divisors (see below), whose sum is σ = 474162660. Its totient is φ = 105369472.

The previous prime is 263423689. The next prime is 263423723. The reversal of 263423690 is 96324362.

It can be written as a sum of positive squares in 2 ways, for example, as 227195329 + 36228361 = 15073^2 + 6019^2 .

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

It is a super-2 number, since 2×263423690² = 138784080906432200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 263423690.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13171175 + ... + 13171194.

Almost surely, 2^263423690 is an apocalyptic number.

263423690 is a deficient number, since it is larger than the sum of its proper divisors (210738970).

263423690 is a wasteful number, since it uses less digits than its factorization.

263423690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26342376.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 263423690 is about 16230.3324057149. The cubic root of 263423690 is about 641.0397243690.

The spelling of 263423690 in words is "two hundred sixty-three million, four hundred twenty-three thousand, six hundred ninety".