1255641220 has 24 divisors (see below), whose sum is σ = 2775628800. Its totient is φ = 475821792.

The previous prime is 1255641119. The next prime is 1255641223. The reversal of 1255641220 is 221465521.

It is not an unprimeable number, because it can be changed into a prime (1255641223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1651780 + ... + 1652539.

It is an arithmetic number, because the mean of its divisors is an integer number (115651200).

Almost surely, 2^1255641220 is an apocalyptic number.

1255641220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255641220 is an abundant number, since it is smaller than the sum of its proper divisors (1519987580).

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

1255641220 is a wasteful number, since it uses less digits than its factorization.

1255641220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304347 (or 3304345 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1255641220 is about 35435.0281501229. The cubic root of 1255641220 is about 1078.8353987140.

The spelling of 1255641220 in words is "one billion, two hundred fifty-five million, six hundred forty-one thousand, two hundred twenty".