1128899540 has 12 divisors (see below), whose sum is σ = 2370689076. Its totient is φ = 451559808.

The previous prime is 1128899539. The next prime is 1128899557. The reversal of 1128899540 is 459988211.

It can be written as a sum of positive squares in 2 ways, for example, as 310252996 + 818646544 = 17614^2 + 28612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28222469 + ... + 28222508.

It is an arithmetic number, because the mean of its divisors is an integer number (197557423).

Almost surely, 2^1128899540 is an apocalyptic number.

1128899540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1128899540 is an abundant number, since it is smaller than the sum of its proper divisors (1241789536).

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

1128899540 is a wasteful number, since it uses less digits than its factorization.

1128899540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56444986 (or 56444984 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 47.

The square root of 1128899540 is about 33599.1002855731. The cubic root of 1128899540 is about 1041.2422101992.

The spelling of 1128899540 in words is "one billion, one hundred twenty-eight million, eight hundred ninety-nine thousand, five hundred forty".