1263564240 has 80 divisors (see below), whose sum is σ = 4012618176. Its totient is φ = 328729600.

The previous prime is 1263564229. The next prime is 1263564257. The reversal of 1263564240 is 424653621.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54366 + ... + 74045.

Almost surely, 2^1263564240 is an apocalyptic number.

1263564240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1263564240 is an abundant number, since it is smaller than the sum of its proper divisors (2749053936).

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

1263564240 is a wasteful number, since it uses less digits than its factorization.

1263564240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128468 (or 128462 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1263564240 is about 35546.6487871923. The cubic root of 1263564240 is about 1081.0997713476.

The spelling of 1263564240 in words is "one billion, two hundred sixty-three million, five hundred sixty-four thousand, two hundred forty".