1125028720 has 40 divisors (see below), whose sum is σ = 2769559344. Its totient is φ = 423539712.

The previous prime is 1125028717. The next prime is 1125028753. The reversal of 1125028720 is 278205211.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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, 412254 + ... + 414973.

Almost surely, 2^1125028720 is an apocalyptic number.

1125028720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1125028720 is an abundant number, since it is smaller than the sum of its proper divisors (1644530624).

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

1125028720 is a wasteful number, since it uses less digits than its factorization.

1125028720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827257 (or 827251 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 1125028720 is about 33541.4477922465. The cubic root of 1125028720 is about 1040.0507618221.

The spelling of 1125028720 in words is "one billion, one hundred twenty-five million, twenty-eight thousand, seven hundred twenty".