263257690 has 8 divisors (see below), whose sum is σ = 473863860. Its totient is φ = 105303072.

The previous prime is 263257663. The next prime is 263257717. The reversal of 263257690 is 96752362.

263257690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (263257663) and next prime (263257717).

It can be written as a sum of positive squares in 2 ways, for example, as 249292521 + 13965169 = 15789^2 + 3737^2 .

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

It is a super-2 number, since 2×263257690² = 138609222688272200, which contains 22 as substring.

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, 13162875 + ... + 13162894.

Almost surely, 2^263257690 is an apocalyptic number.

263257690 is a deficient number, since it is larger than the sum of its proper divisors (210606170).

263257690 is a wasteful number, since it uses less digits than its factorization.

263257690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26325776.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 263257690 is about 16225.2177181078. The cubic root of 263257690 is about 640.9050427913.

The spelling of 263257690 in words is "two hundred sixty-three million, two hundred fifty-seven thousand, six hundred ninety".