263640104 has 32 divisors (see below), whose sum is σ = 608401920. Its totient is φ = 104296896.

The previous prime is 263640037. The next prime is 263640107. The reversal of 263640104 is 401046362.

It is a super-2 number, since 2×263640104² = 139012208874261632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (263640107) 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, 180344 + ... + 181799.

It is an arithmetic number, because the mean of its divisors is an integer number (19012560).

Almost surely, 2^263640104 is an apocalyptic number.

It is an amenable number.

263640104 is an abundant number, since it is smaller than the sum of its proper divisors (344761816).

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

263640104 is a wasteful number, since it uses less digits than its factorization.

263640104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362169 (or 362165 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 263640104 is about 16236.9979983986. The cubic root of 263640104 is about 641.2152236409.

Adding to 263640104 its reverse (401046362), we get a palindrome (664686466).

The spelling of 263640104 in words is "two hundred sixty-three million, six hundred forty thousand, one hundred four".