28620669 has 32 divisors (see below), whose sum is σ = 50088960. Its totient is φ = 14083200.

The previous prime is 28620667. The next prime is 28620701. The reversal of 28620669 is 96602682.

It is not a de Polignac number, because 28620669 - 2¹ = 28620667 is a prime.

It is a super-3 number, since 3×28620669³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28620661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1129 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (1565280).

Almost surely, 2^28620669 is an apocalyptic number.

It is an amenable number.

28620669 is a deficient number, since it is larger than the sum of its proper divisors (21468291).

28620669 is a wasteful number, since it uses less digits than its factorization.

28620669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6561.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 28620669 is about 5349.8288757679. The cubic root of 28620669 is about 305.8862300798.

The spelling of 28620669 in words is "twenty-eight million, six hundred twenty thousand, six hundred sixty-nine".