263868891 has 32 divisors (see below), whose sum is σ = 418037760. Its totient is φ = 145939200.

The previous prime is 263868889. The next prime is 263868911. The reversal of 263868891 is 198868362.

It is not a de Polignac number, because 263868891 - 2¹ = 263868889 is a prime.

It is a super-4 number, since 4×263868891⁴ (a number of 35 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (263868841) 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, 34726 + ... + 41636.

It is an arithmetic number, because the mean of its divisors is an integer number (13063680).

Almost surely, 2^263868891 is an apocalyptic number.

263868891 is a deficient number, since it is larger than the sum of its proper divisors (154168869).

263868891 is a wasteful number, since it uses less digits than its factorization.

263868891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027.

The product of its digits is 995328, while the sum is 51.

The square root of 263868891 is about 16244.0417076539. The cubic root of 263868891 is about 641.4006522987.

The spelling of 263868891 in words is "two hundred sixty-three million, eight hundred sixty-eight thousand, eight hundred ninety-one".