1128212780 has 48 divisors (see below), whose sum is σ = 2505941760. Its totient is φ = 425476800.

The previous prime is 1128212777. The next prime is 1128212783. The reversal of 1128212780 is 872128211.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1128212777) and next prime (1128212783).

It is not an unprimeable number, because it can be changed into a prime (1128212783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73145 + ... + 87215.

It is an arithmetic number, because the mean of its divisors is an integer number (52207120).

Almost surely, 2^1128212780 is an apocalyptic number.

1128212780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1128212780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1252970880).

1128212780 is an abundant number, since it is smaller than the sum of its proper divisors (1377728980).

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

1128212780 is a wasteful number, since it uses less digits than its factorization.

1128212780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14310 (or 14308 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 32.

The square root of 1128212780 is about 33588.8788142742. The cubic root of 1128212780 is about 1041.0310226578.

The spelling of 1128212780 in words is "one billion, one hundred twenty-eight million, two hundred twelve thousand, seven hundred eighty".