263720385 has 48 divisors (see below), whose sum is σ = 467970048. Its totient is φ = 137347200.

The previous prime is 263720363. The next prime is 263720389. The reversal of 263720385 is 583027362.

263720385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 263720385 - 2⁸ = 263720129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (263720389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 524044 + ... + 524546.

It is an arithmetic number, because the mean of its divisors is an integer number (9749376).

Almost surely, 2^263720385 is an apocalyptic number.

It is an amenable number.

263720385 is a deficient number, since it is larger than the sum of its proper divisors (204249663).

263720385 is a wasteful number, since it uses less digits than its factorization.

263720385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 263720385 is about 16239.4699728778. The cubic root of 263720385 is about 641.2803024792.

The spelling of 263720385 in words is "two hundred sixty-three million, seven hundred twenty thousand, three hundred eighty-five".