290668788506 has 8 divisors (see below), whose sum is σ = 436034652564. Its totient is φ = 145323904320.

The previous prime is 290668788503. The next prime is 290668788541. The reversal of 290668788506 is 605887866092.

It can be written as a sum of positive squares in 2 ways, for example, as 255019950025 + 35648838481 = 504995^2 + 188809^2 .

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

It is a super-2 number, since 2×290668788506² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (290668788503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5210285 + ... + 5265776.

Almost surely, 2^290668788506 is an apocalyptic number.

290668788506 is a deficient number, since it is larger than the sum of its proper divisors (145365864058).

290668788506 is a wasteful number, since it uses less digits than its factorization.

290668788506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10489936.

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 290668788506 in words is "two hundred ninety billion, six hundred sixty-eight million, seven hundred eighty-eight thousand, five hundred six".