28730261 has 16 divisors (see below), whose sum is σ = 34719360. Its totient is φ = 23224320.

The previous prime is 28730237. The next prime is 28730263. The reversal of 28730261 is 16203782.

It is a happy number.

It is not a de Polignac number, because 28730261 - 2¹⁰ = 28729237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28730263) 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, 44501 + ... + 45141.

It is an arithmetic number, because the mean of its divisors is an integer number (2169960).

Almost surely, 2^28730261 is an apocalyptic number.

It is an amenable number.

28730261 is a deficient number, since it is larger than the sum of its proper divisors (5989099).

28730261 is a wasteful number, since it uses less digits than its factorization.

28730261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 28730261 is about 5360.0616600931. The cubic root of 28730261 is about 306.2761579212.

The spelling of 28730261 in words is "twenty-eight million, seven hundred thirty thousand, two hundred sixty-one".