290383820 has 48 divisors (see below), whose sum is σ = 641426688. Its totient is φ = 110273280.

The previous prime is 290383799. The next prime is 290383837. The reversal of 290383820 is 28383092.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28442 + ... + 37278.

It is an arithmetic number, because the mean of its divisors is an integer number (13363056).

Almost surely, 2^290383820 is an apocalyptic number.

290383820 is a gapful number since it is divisible by the number (20) 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 290383820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320713344).

290383820 is an abundant number, since it is smaller than the sum of its proper divisors (351042868).

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

290383820 is a wasteful number, since it uses less digits than its factorization.

290383820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8930 (or 8928 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 290383820 is about 17040.6519828321. The cubic root of 290383820 is about 662.2024827624.

The spelling of 290383820 in words is "two hundred ninety million, three hundred eighty-three thousand, eight hundred twenty".