1263504256 has 64 divisors (see below), whose sum is σ = 3028176000. Its totient is φ = 512994816.

The previous prime is 1263504251. The next prime is 1263504299. The reversal of 1263504256 is 6524053621.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1263504256² = 3192886009860227072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263504251) 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, 20086 + ... + 54133.

It is an arithmetic number, because the mean of its divisors is an integer number (47315250).

Almost surely, 2^1263504256 is an apocalyptic number.

1263504256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1263504256 is an abundant number, since it is smaller than the sum of its proper divisors (1764671744).

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

1263504256 is an equidigital number, since it uses as much as digits as its factorization.

1263504256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74259 (or 74247 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1263504256 is about 35545.8050408202. The cubic root of 1263504256 is about 1081.0826637317.

Adding to 1263504256 its reverse (6524053621), we get a palindrome (7787557877).

The spelling of 1263504256 in words is "one billion, two hundred sixty-three million, five hundred four thousand, two hundred fifty-six".