290945988 has 18 divisors (see below), whose sum is σ = 735446894. Its totient is φ = 96981984.

The previous prime is 290945969. The next prime is 290945989. The reversal of 290945988 is 889549092.

290945988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 271656324 + 19289664 = 16482^2 + 4392^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×290945988² = 169299135866592288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (290945989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4040881 + ... + 4040952.

Almost surely, 2^290945988 is an apocalyptic number.

It is an amenable number.

290945988 is an abundant number, since it is smaller than the sum of its proper divisors (444500906).

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

290945988 is a wasteful number, since it uses less digits than its factorization.

290945988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8081843 (or 8081838 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The square root of 290945988 is about 17057.1389160082. The cubic root of 290945988 is about 662.6295371717.

The spelling of 290945988 in words is "two hundred ninety million, nine hundred forty-five thousand, nine hundred eighty-eight".