28972371 has 4 divisors (see below), whose sum is σ = 38629832. Its totient is φ = 19314912.

The previous prime is 28972367. The next prime is 28972379. The reversal of 28972371 is 17327982.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28972371 - 2² = 28972367 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28972379) 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 3 ways as a sum of consecutive naturals, for example, 4828726 + ... + 4828731.

It is an arithmetic number, because the mean of its divisors is an integer number (9657458).

Almost surely, 2^28972371 is an apocalyptic number.

28972371 is a deficient number, since it is larger than the sum of its proper divisors (9657461).

28972371 is an equidigital number, since it uses as much as digits as its factorization.

28972371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657460.

The product of its digits is 42336, while the sum is 39.

The square root of 28972371 is about 5382.5989075910. The cubic root of 28972371 is about 307.1340825534.

The spelling of 28972371 in words is "twenty-eight million, nine hundred seventy-two thousand, three hundred seventy-one".