28972051 has 4 divisors (see below), whose sum is σ = 28986552. Its totient is φ = 28957552.

The previous prime is 28972049. The next prime is 28972087. The reversal of 28972051 is 15027982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15027982 = 2 ⋅7513991.

It is a cyclic number.

It is not a de Polignac number, because 28972051 - 2¹ = 28972049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28971998 and 28972016.

It is not an unprimeable number, because it can be changed into a prime (28972001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3661 + ... + 8446.

It is an arithmetic number, because the mean of its divisors is an integer number (7246638).

Almost surely, 2^28972051 is an apocalyptic number.

28972051 is a deficient number, since it is larger than the sum of its proper divisors (14501).

28972051 is a wasteful number, since it uses less digits than its factorization.

28972051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14500.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28972051 is about 5382.5691820914. The cubic root of 28972051 is about 307.1329517834.

The spelling of 28972051 in words is "twenty-eight million, nine hundred seventy-two thousand, fifty-one".