263887640 has 32 divisors (see below), whose sum is σ = 594270000. Its totient is φ = 105462144.

The previous prime is 263887639. The next prime is 263887643. The reversal of 263887640 is 46788362.

It is a junction number, because it is equal to n+sod(n) for n = 263887591 and 263887600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263887643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59831 + ... + 64089.

Almost surely, 2^263887640 is an apocalyptic number.

263887640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

263887640 is an abundant number, since it is smaller than the sum of its proper divisors (330382360).

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

263887640 is a wasteful number, since it uses less digits than its factorization.

263887640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5819 (or 5815 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 263887640 is about 16244.6188013139. The cubic root of 263887640 is about 641.4158433480.

The spelling of 263887640 in words is "two hundred sixty-three million, eight hundred eighty-seven thousand, six hundred forty".