1255288320 has 640 divisors, whose sum is σ = 5279662080. Its totient is φ = 278691840.

The previous prime is 1255288291. The next prime is 1255288429. The reversal of 1255288320 is 238825521.

1255288320 is a `hidden beast` number, since 1 + 2 + 55 + 288 + 320 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9884097 + ... + 9884223.

It is an arithmetic number, because the mean of its divisors is an integer number (8249472).

Almost surely, 2^1255288320 is an apocalyptic number.

1255288320 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 1255288320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2639831040).

1255288320 is an abundant number, since it is smaller than the sum of its proper divisors (4024373760).

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

1255288320 is a wasteful number, since it uses less digits than its factorization.

1255288320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 1255288320 is about 35430.0482641500. The cubic root of 1255288320 is about 1078.7343197648.

The spelling of 1255288320 in words is "one billion, two hundred fifty-five million, two hundred eighty-eight thousand, three hundred twenty".