28726971 has 16 divisors (see below), whose sum is σ = 47142144. Its totient is φ = 15152544.

The previous prime is 28726969. The next prime is 28726979. The reversal of 28726971 is 17962782.

It is not a de Polignac number, because 28726971 - 2¹ = 28726969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28726979) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52341 + ... + 52886.

It is an arithmetic number, because the mean of its divisors is an integer number (2946384).

Almost surely, 2^28726971 is an apocalyptic number.

28726971 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28726971 is a deficient number, since it is larger than the sum of its proper divisors (18415173).

28726971 is a wasteful number, since it uses less digits than its factorization.

28726971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105250.

The product of its digits is 84672, while the sum is 42.

The square root of 28726971 is about 5359.7547518520. The cubic root of 28726971 is about 306.2644665664.

The spelling of 28726971 in words is "twenty-eight million, seven hundred twenty-six thousand, nine hundred seventy-one".