28731669 has 8 divisors (see below), whose sum is σ = 39974592. Its totient is φ = 18321600.

The previous prime is 28731631. The next prime is 28731701. The reversal of 28731669 is 96613782.

It is a happy number.

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

It is not a de Polignac number, because 28731669 - 2¹¹ = 28729621 is a prime.

It is a super-2 number, since 2×28731669² = 1651017607051122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28731669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28731569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208132 + ... + 208269.

It is an arithmetic number, because the mean of its divisors is an integer number (4996824).

Almost surely, 2^28731669 is an apocalyptic number.

It is an amenable number.

28731669 is a deficient number, since it is larger than the sum of its proper divisors (11242923).

28731669 is a wasteful number, since it uses less digits than its factorization.

28731669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416427.

The product of its digits is 108864, while the sum is 42.

The square root of 28731669 is about 5360.1930002566. The cubic root of 28731669 is about 306.2811611219.

The spelling of 28731669 in words is "twenty-eight million, seven hundred thirty-one thousand, six hundred sixty-nine".