28971669 has 8 divisors (see below), whose sum is σ = 39027520. Its totient is φ = 19115136.

The previous prime is 28971643. The next prime is 28971721. The reversal of 28971669 is 96617982.

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

It is not a de Polignac number, because 28971669 - 2⁷ = 28971541 is a prime.

It is a super-2 number, since 2×28971669² = 1678715209291122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49489 + ... + 50070.

It is an arithmetic number, because the mean of its divisors is an integer number (4878440).

Almost surely, 2^28971669 is an apocalyptic number.

It is an amenable number.

28971669 is a deficient number, since it is larger than the sum of its proper divisors (10055851).

28971669 is an equidigital number, since it uses as much as digits as its factorization.

28971669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99659.

The product of its digits is 326592, while the sum is 48.

The square root of 28971669 is about 5382.5336970613. The cubic root of 28971669 is about 307.1316019157.

The spelling of 28971669 in words is "twenty-eight million, nine hundred seventy-one thousand, six hundred sixty-nine".