263487820 has 48 divisors (see below), whose sum is σ = 583884000. Its totient is φ = 99601920.

The previous prime is 263487803. The next prime is 263487827. The reversal of 263487820 is 28784362.

It is not an unprimeable number, because it can be changed into a prime (263487827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250656 + ... + 251704.

It is an arithmetic number, because the mean of its divisors is an integer number (12164250).

Almost surely, 2^263487820 is an apocalyptic number.

263487820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 263487820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291942000).

263487820 is an abundant number, since it is smaller than the sum of its proper divisors (320396180).

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

263487820 is a wasteful number, since it uses less digits than its factorization.

263487820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 263487820 is about 16232.3079073803. The cubic root of 263487820 is about 641.0917401184.

The spelling of 263487820 in words is "two hundred sixty-three million, four hundred eighty-seven thousand, eight hundred twenty".