263640044 has 36 divisors (see below), whose sum is σ = 482882400. Its totient is φ = 125931456.

The previous prime is 263640037. The next prime is 263640107. The reversal of 263640044 is 440046362.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 263639989 and 263640016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 366317 + ... + 367035.

It is an arithmetic number, because the mean of its divisors is an integer number (13413400).

Almost surely, 2^263640044 is an apocalyptic number.

It is an amenable number.

263640044 is a deficient number, since it is larger than the sum of its proper divisors (219242356).

263640044 is a wasteful number, since it uses less digits than its factorization.

263640044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 263640044 is about 16236.9961507663. The cubic root of 263640044 is about 641.2151749976.

The spelling of 263640044 in words is "two hundred sixty-three million, six hundred forty thousand, forty-four".