1290489228 has 72 divisors (see below), whose sum is σ = 3736212480. Its totient is φ = 367907040.

The previous prime is 1290489203. The next prime is 1290489247. The reversal of 1290489228 is 8229840921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115363 + ... + 126053.

It is an arithmetic number, because the mean of its divisors is an integer number (51891840).

Almost surely, 2^1290489228 is an apocalyptic number.

1290489228 is a gapful number since it is divisible by the number (18) 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 1290489228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1868106240).

1290489228 is an abundant number, since it is smaller than the sum of its proper divisors (2445723252).

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

1290489228 is a wasteful number, since it uses less digits than its factorization.

1290489228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11187 (or 11182 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 1290489228 is about 35923.3799634723. The cubic root of 1290489228 is about 1088.7248303636.

The spelling of 1290489228 in words is "one billion, two hundred ninety million, four hundred eighty-nine thousand, two hundred twenty-eight".