263997820 has 12 divisors (see below), whose sum is σ = 554395464. Its totient is φ = 105599120.

The previous prime is 263997791. The next prime is 263997847. The reversal of 263997820 is 28799362.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6599926 + ... + 6599965.

It is an arithmetic number, because the mean of its divisors is an integer number (46199622).

Almost surely, 2^263997820 is an apocalyptic number.

263997820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263997820 is an abundant number, since it is smaller than the sum of its proper divisors (290397644).

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

263997820 is a wasteful number, since it uses less digits than its factorization.

263997820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13199900 (or 13199898 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 263997820 is about 16248.0097242708. The cubic root of 263997820 is about 641.5051002305.

The spelling of 263997820 in words is "two hundred sixty-three million, nine hundred ninety-seven thousand, eight hundred twenty".