263640146 has 16 divisors (see below), whose sum is σ = 493041600. Its totient is φ = 102716880.

The previous prime is 263640137. The next prime is 263640193. The reversal of 263640146 is 641046362.

It is a super-2 number, since 2×263640146² = 139012253165802632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855821 + ... + 856128.

It is an arithmetic number, because the mean of its divisors is an integer number (30815100).

Almost surely, 2^263640146 is an apocalyptic number.

263640146 is a deficient number, since it is larger than the sum of its proper divisors (229401454).

263640146 is a wasteful number, since it uses less digits than its factorization.

263640146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1711969.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 263640146 is about 16236.9992917411. Note that the first 3 decimals coincide. The cubic root of 263640146 is about 641.2152576911.

The spelling of 263640146 in words is "two hundred sixty-three million, six hundred forty thousand, one hundred forty-six".