263847840 has 48 divisors (see below), whose sum is σ = 831122208. Its totient is φ = 70359296.

The previous prime is 263847821. The next prime is 263847847. The reversal of 263847840 is 48748362.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 263847792 and 263847801.

It is not an unprimeable number, because it can be changed into a prime (263847847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 274362 + ... + 275321.

It is an arithmetic number, because the mean of its divisors is an integer number (17315046).

Almost surely, 2^263847840 is an apocalyptic number.

263847840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263847840 is an abundant number, since it is smaller than the sum of its proper divisors (567274368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

263847840 is a wasteful number, since it uses less digits than its factorization.

263847840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549701 (or 549693 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 263847840 is about 16243.3937340692. The cubic root of 263847840 is about 641.3835952365.

The spelling of 263847840 in words is "two hundred sixty-three million, eight hundred forty-seven thousand, eight hundred forty".