1255636800 has 252 divisors, whose sum is σ = 4869155616. Its totient is φ = 304358400.

The previous prime is 1255636783. The next prime is 1255636801. The reversal of 1255636800 is 86365521.

1255636800 is a `hidden beast` number, since 12 + 5 + 5 + 636 + 8 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255636801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 154437 + ... + 162363.

Almost surely, 2^1255636800 is an apocalyptic number.

1255636800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1255636800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2434577808).

1255636800 is an abundant number, since it is smaller than the sum of its proper divisors (3613518816).

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

1255636800 is a wasteful number, since it uses less digits than its factorization.

1255636800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7966 (or 7948 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1255636800 is about 35434.9657824020. The cubic root of 1255636800 is about 1078.8341328380.

The spelling of 1255636800 in words is "one billion, two hundred fifty-five million, six hundred thirty-six thousand, eight hundred".