263497440 has 48 divisors (see below), whose sum is σ = 830018448. Its totient is φ = 70265856.

The previous prime is 263497373. The next prime is 263497459. The reversal of 263497440 is 44794362.

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

It is a congruent number.

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, 273997 + ... + 274956.

It is an arithmetic number, because the mean of its divisors is an integer number (17292051).

Almost surely, 2^263497440 is an apocalyptic number.

263497440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263497440 is an abundant number, since it is smaller than the sum of its proper divisors (566521008).

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

263497440 is a wasteful number, since it uses less digits than its factorization.

263497440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548971 (or 548963 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 263497440 is about 16232.6042272951. The cubic root of 263497440 is about 641.0995421584.

The spelling of 263497440 in words is "two hundred sixty-three million, four hundred ninety-seven thousand, four hundred forty".