290990128 has 80 divisors (see below), whose sum is σ = 670269600. Its totient is φ = 120637440.

The previous prime is 290990123. The next prime is 290990129. The reversal of 290990128 is 821099092.

It is not an unprimeable number, because it can be changed into a prime (290990123) 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, 202918 + ... + 204346.

It is an arithmetic number, because the mean of its divisors is an integer number (8378370).

Almost surely, 2^290990128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 290990128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335134800).

290990128 is an abundant number, since it is smaller than the sum of its proper divisors (379279472).

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

290990128 is a wasteful number, since it uses less digits than its factorization.

290990128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550 (or 1544 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 290990128 is about 17058.4327533335. The cubic root of 290990128 is about 662.6630450964.

The spelling of 290990128 in words is "two hundred ninety million, nine hundred ninety thousand, one hundred twenty-eight".