290428641 has 6 divisors (see below), whose sum is σ = 419508050. Its totient is φ = 193619088.

The previous prime is 290428639. The next prime is 290428643. The reversal of 290428641 is 146824092.

290428641 is a `hidden beast` number, since 2 + 9 + 0 + 4 + 2 + 8 + 641 = 666.

It is an interprime number because it is at equal distance from previous prime (290428639) and next prime (290428643).

It can be written as a sum of positive squares in only one way, i.e., 148937616 + 141491025 = 12204^2 + 11895^2 .

It is not a de Polignac number, because 290428641 - 2¹ = 290428639 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 290428596 and 290428605.

It is not an unprimeable number, because it can be changed into a prime (290428643) 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, 16134916 + ... + 16134933.

Almost surely, 2^290428641 is an apocalyptic number.

It is an amenable number.

290428641 is a deficient number, since it is larger than the sum of its proper divisors (129079409).

290428641 is a wasteful number, since it uses less digits than its factorization.

290428641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32269855 (or 32269852 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 290428641 is about 17041.9670519574. The cubic root of 290428641 is about 662.2365515230.

The spelling of 290428641 in words is "two hundred ninety million, four hundred twenty-eight thousand, six hundred forty-one".