2028857490 has 128 divisors (see below), whose sum is σ = 6013958400. Its totient is φ = 482526720.

The previous prime is 2028857477. The next prime is 2028857491. The reversal of 2028857490 is 947588202.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (2028857491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 150966 + ... + 163854.

It is an arithmetic number, because the mean of its divisors is an integer number (46984050).

Almost surely, 2^2028857490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2028857490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3006979200).

2028857490 is an abundant number, since it is smaller than the sum of its proper divisors (3985100910).

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

2028857490 is a wasteful number, since it uses less digits than its factorization.

2028857490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969 (or 12963 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 2028857490 is about 45042.8406075816. The cubic root of 2028857490 is about 1265.9518298871.

The spelling of 2028857490 in words is "two billion, twenty-eight million, eight hundred fifty-seven thousand, four hundred ninety".