290890666 has 8 divisors (see below), whose sum is σ = 476002944. Its totient is φ = 132223020.

The previous prime is 290890651. The next prime is 290890697. The reversal of 290890666 is 666098092.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6611130 + ... + 6611173.

It is an arithmetic number, because the mean of its divisors is an integer number (59500368).

Almost surely, 2^290890666 is an apocalyptic number.

290890666 is a deficient number, since it is larger than the sum of its proper divisors (185112278).

290890666 is a wasteful number, since it uses less digits than its factorization.

290890666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13222316.

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 290890666 is about 17055.5171718714. The cubic root of 290890666 is about 662.5875358880.

The spelling of 290890666 in words is "two hundred ninety million, eight hundred ninety thousand, six hundred sixty-six".