28971965 has 8 divisors (see below), whose sum is σ = 37927008. Its totient is φ = 21070480.

The previous prime is 28971947. The next prime is 28971983. The reversal of 28971965 is 56917982.

It is an interprime number because it is at equal distance from previous prime (28971947) and next prime (28971983).

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

It is not a de Polignac number, because 28971965 - 2²² = 24777661 is a prime.

It is a super-2 number, since 2×28971965² = 1678749511922450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263327 + ... + 263436.

It is an arithmetic number, because the mean of its divisors is an integer number (4740876).

Almost surely, 2^28971965 is an apocalyptic number.

It is an amenable number.

28971965 is a deficient number, since it is larger than the sum of its proper divisors (8955043).

28971965 is a wasteful number, since it uses less digits than its factorization.

28971965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526779.

The product of its digits is 272160, while the sum is 47.

The square root of 28971965 is about 5382.5611933354. The cubic root of 28971965 is about 307.1326478875.

The spelling of 28971965 in words is "twenty-eight million, nine hundred seventy-one thousand, nine hundred sixty-five".