28972971 has 20 divisors (see below), whose sum is σ = 43777800. Its totient is φ = 19093536.

The previous prime is 28972969. The next prime is 28972991. The reversal of 28972971 is 17927982.

It is not a de Polignac number, because 28972971 - 2¹ = 28972969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28972991) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5200 + ... + 9218.

It is an arithmetic number, because the mean of its divisors is an integer number (2188890).

Almost surely, 2^28972971 is an apocalyptic number.

28972971 is a deficient number, since it is larger than the sum of its proper divisors (14804829).

28972971 is an equidigital number, since it uses as much as digits as its factorization.

28972971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4120 (or 4111 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 28972971 is about 5382.6546424604. The cubic root of 28972971 is about 307.1362027248.

The spelling of 28972971 in words is "twenty-eight million, nine hundred seventy-two thousand, nine hundred seventy-one".