28169661 has 8 divisors (see below), whose sum is σ = 40448800. Its totient is φ = 17335152.

The previous prime is 28169651. The next prime is 28169671. The reversal of 28169661 is 16696182.

It is an interprime number because it is at equal distance from previous prime (28169651) and next prime (28169671).

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

It is not a de Polignac number, because 28169661 - 2⁶ = 28169597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 722299 = 28169661 / (2 + 8 + 1 + 6 + 9 + 6 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28169651) 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 7 ways as a sum of consecutive naturals, for example, 361111 + ... + 361188.

It is an arithmetic number, because the mean of its divisors is an integer number (5056100).

Almost surely, 2^28169661 is an apocalyptic number.

It is an amenable number.

28169661 is a deficient number, since it is larger than the sum of its proper divisors (12279139).

28169661 is a wasteful number, since it uses less digits than its factorization.

28169661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722315.

The product of its digits is 31104, while the sum is 39.

The square root of 28169661 is about 5307.5098681020. The cubic root of 28169661 is about 304.2709848561.

The spelling of 28169661 in words is "twenty-eight million, one hundred sixty-nine thousand, six hundred sixty-one".