28938261 has 32 divisors (see below), whose sum is σ = 43545600. Its totient is φ = 16945280.

The previous prime is 28938241. The next prime is 28938263. The reversal of 28938261 is 16283982.

It is a happy number.

It is not a de Polignac number, because 28938261 - 2¹¹ = 28936213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28938263) 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 31 ways as a sum of consecutive naturals, for example, 173200 + ... + 173366.

It is an arithmetic number, because the mean of its divisors is an integer number (1360800).

Almost surely, 2^28938261 is an apocalyptic number.

It is an amenable number.

28938261 is a deficient number, since it is larger than the sum of its proper divisors (14607339).

28938261 is a wasteful number, since it uses less digits than its factorization.

28938261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329.

The product of its digits is 41472, while the sum is 39.

The square root of 28938261 is about 5379.4294307110. The cubic root of 28938261 is about 307.0135026440.

The spelling of 28938261 in words is "twenty-eight million, nine hundred thirty-eight thousand, two hundred sixty-one".