263641287 has 32 divisors (see below), whose sum is σ = 458099712. Its totient is φ = 130881024.

The previous prime is 263641237. The next prime is 263641289. The reversal of 263641287 is 782146362.

It is a happy number.

It is not a de Polignac number, because 263641287 - 2⁸ = 263641031 is a prime.

It is a super-2 number, since 2×263641287² = 139013456422032738, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263641289) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23763 + ... + 33044.

It is an arithmetic number, because the mean of its divisors is an integer number (14315616).

Almost surely, 2^263641287 is an apocalyptic number.

263641287 is a deficient number, since it is larger than the sum of its proper divisors (194458425).

263641287 is a wasteful number, since it uses less digits than its factorization.

263641287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56847.

The product of its digits is 96768, while the sum is 39.

The square root of 263641287 is about 16237.0344275055. The cubic root of 263641287 is about 641.2161827216.

The spelling of 263641287 in words is "two hundred sixty-three million, six hundred forty-one thousand, two hundred eighty-seven".