28923261 has 4 divisors (see below), whose sum is σ = 38564352. Its totient is φ = 19282172.

The previous prime is 28923241. The next prime is 28923281. The reversal of 28923261 is 16232982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28923241) and next prime (28923281).

It is a cyclic number.

It is not a de Polignac number, because 28923261 - 2⁹ = 28922749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28923221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4820541 + ... + 4820546.

It is an arithmetic number, because the mean of its divisors is an integer number (9641088).

Almost surely, 2^28923261 is an apocalyptic number.

It is an amenable number.

28923261 is a deficient number, since it is larger than the sum of its proper divisors (9641091).

28923261 is an equidigital number, since it uses as much as digits as its factorization.

28923261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9641090.

The product of its digits is 10368, while the sum is 33.

The square root of 28923261 is about 5378.0350500903. The cubic root of 28923261 is about 306.9604471815.

The spelling of 28923261 in words is "twenty-eight million, nine hundred twenty-three thousand, two hundred sixty-one".