290728691 has 18 divisors (see below), whose sum is σ = 326622492. Its totient is φ = 256638720.

The previous prime is 290728681. The next prime is 290728703. The reversal of 290728691 is 196827092.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-290728691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (290728681) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2997155 + ... + 2997251.

It is an arithmetic number, because the mean of its divisors is an integer number (18145694).

Almost surely, 2^290728691 is an apocalyptic number.

290728691 is a deficient number, since it is larger than the sum of its proper divisors (35893801).

290728691 is an frugal number, since it uses more digits than its factorization.

290728691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 290728691 is about 17050.7680472171. The cubic root of 290728691 is about 662.4645314345.

Multiplying 290728691 by its sum of digits (44), we get a square (12792062404 = 113102²).

The spelling of 290728691 in words is "two hundred ninety million, seven hundred twenty-eight thousand, six hundred ninety-one".