1128890440 has 32 divisors (see below), whose sum is σ = 2689417080. Its totient is φ = 424993792.

The previous prime is 1128890431. The next prime is 1128890443. The reversal of 1128890440 is 440988211.

It can be written as a sum of positive squares in 4 ways, for example, as 690323076 + 438567364 = 26274^2 + 20942^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1128890440.

It is not an unprimeable number, because it can be changed into a prime (1128890443) 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, 829387 + ... + 830746.

Almost surely, 2^1128890440 is an apocalyptic number.

1128890440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1128890440 is an abundant number, since it is smaller than the sum of its proper divisors (1560526640).

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

1128890440 is a wasteful number, since it uses less digits than its factorization.

1128890440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660161 (or 1660157 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 1128890440 is about 33598.9648650074. The cubic root of 1128890440 is about 1041.2394123920.

The spelling of 1128890440 in words is "one billion, one hundred twenty-eight million, eight hundred ninety thousand, four hundred forty".