290805380 has 24 divisors (see below), whose sum is σ = 613439232. Its totient is φ = 115798752.

The previous prime is 290805377. The next prime is 290805407. The reversal of 290805380 is 83508092.

It is a self number, because there is not a number n which added to its sum of digits gives 290805380.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28142 + ... + 37061.

It is an arithmetic number, because the mean of its divisors is an integer number (25559968).

Almost surely, 2^290805380 is an apocalyptic number.

290805380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

290805380 is an abundant number, since it is smaller than the sum of its proper divisors (322633852).

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

290805380 is a wasteful number, since it uses less digits than its factorization.

290805380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65435 (or 65433 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 290805380 is about 17053.0167419140. The cubic root of 290805380 is about 662.5227750566.

The spelling of 290805380 in words is "two hundred ninety million, eight hundred five thousand, three hundred eighty".