1255520000 has 360 divisors, whose sum is σ = 3831273600. Its totient is φ = 400896000.

The previous prime is 1255519987. The next prime is 1255520003. The reversal of 1255520000 is 255521.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255520003) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21279971 + ... + 21280029.

Almost surely, 2^1255520000 is an apocalyptic number.

1255520000 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 1255520000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915636800).

1255520000 is an abundant number, since it is smaller than the sum of its proper divisors (2575753600).

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

1255520000 is an frugal number, since it uses more digits than its factorization.

1255520000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 1255520000 is about 35433.3176544337. The cubic root of 1255520000 is about 1078.8006805600.

Adding to 1255520000 its reverse (255521), we get a palindrome (1255775521).

The spelling of 1255520000 in words is "one billion, two hundred fifty-five million, five hundred twenty thousand".