1264004256 has 48 divisors (see below), whose sum is σ = 3323333664. Its totient is φ = 420658944.

The previous prime is 1264004243. The next prime is 1264004297. The reversal of 1264004256 is 6524004621.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1264004256² = 3195413518372227072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51490 + ... + 71966.

It is an arithmetic number, because the mean of its divisors is an integer number (69236118).

Almost surely, 2^1264004256 is an apocalyptic number.

1264004256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1264004256 is an abundant number, since it is smaller than the sum of its proper divisors (2059329408).

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

1264004256 is a wasteful number, since it uses less digits than its factorization.

1264004256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21133 (or 21125 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 1264004256 is about 35552.8375238883. The cubic root of 1264004256 is about 1081.2252486744.

Adding to 1264004256 its reverse (6524004621), we get a palindrome (7788008877).

The spelling of 1264004256 in words is "one billion, two hundred sixty-four million, four thousand, two hundred fifty-six".