290220861 has 8 divisors (see below), whose sum is σ = 442241344. Its totient is φ = 165840480.

The previous prime is 290220857. The next prime is 290220863. The reversal of 290220861 is 168022092.

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

It is not a de Polignac number, because 290220861 - 2² = 290220857 is a prime.

It is a super-3 number, since 3×290220861³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (290220863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6910000 + ... + 6910041.

It is an arithmetic number, because the mean of its divisors is an integer number (55280168).

Almost surely, 2^290220861 is an apocalyptic number.

290220861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

290220861 is a deficient number, since it is larger than the sum of its proper divisors (152020483).

290220861 is a wasteful number, since it uses less digits than its factorization.

290220861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13820051.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 290220861 is about 17035.8698339709. The cubic root of 290220861 is about 662.0785869167.

The spelling of 290220861 in words is "two hundred ninety million, two hundred twenty thousand, eight hundred sixty-one".