289449990 has 128 divisors (see below), whose sum is σ = 860544000. Its totient is φ = 68802048.

The previous prime is 289449977. The next prime is 289449991. The reversal of 289449990 is 99944982.

It is a super-2 number, since 2×289449990² = 167562593422000200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289449991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85551 + ... + 88869.

It is an arithmetic number, because the mean of its divisors is an integer number (6723000).

Almost surely, 2^289449990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289449990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430272000).

289449990 is an abundant number, since it is smaller than the sum of its proper divisors (571094010).

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

289449990 is a wasteful number, since it uses less digits than its factorization.

289449990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371 (or 3365 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 289449990 is about 17013.2298520886. The cubic root of 289449990 is about 661.4918731423.

The spelling of 289449990 in words is "two hundred eighty-nine million, four hundred forty-nine thousand, nine hundred ninety".