28973551 has 2 divisors, whose sum is σ = 28973552. Its totient is φ = 28973550.

The previous prime is 28973531. The next prime is 28973579. The reversal of 28973551 is 15537982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28973551 - 2⁵ = 28973519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28973501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14486775 + 14486776.

It is an arithmetic number, because the mean of its divisors is an integer number (14486776).

Almost surely, 2^28973551 is an apocalyptic number.

28973551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28973551 is an equidigital number, since it uses as much as digits as its factorization.

28973551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 40.

The square root of 28973551 is about 5382.7085189521. The cubic root of 28973551 is about 307.1382521960.

The spelling of 28973551 in words is "twenty-eight million, nine hundred seventy-three thousand, five hundred fifty-one".