1255515320 has 32 divisors (see below), whose sum is σ = 2863613520. Its totient is φ = 495325440.

The previous prime is 1255515311. The next prime is 1255515323. The reversal of 1255515320 is 235155521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255515323) 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, 212066 + ... + 217905.

Almost surely, 2^1255515320 is an apocalyptic number.

1255515320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255515320 is an abundant number, since it is smaller than the sum of its proper divisors (1608098200).

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

1255515320 is a wasteful number, since it uses less digits than its factorization.

1255515320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430055 (or 430051 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 1255515320 is about 35433.2516148321. The cubic root of 1255515320 is about 1078.7993401344.

The spelling of 1255515320 in words is "one billion, two hundred fifty-five million, five hundred fifteen thousand, three hundred twenty".