28952309 has 16 divisors (see below), whose sum is σ = 31570560. Its totient is φ = 26541760.

The previous prime is 28952293. The next prime is 28952327. The reversal of 28952309 is 90325982.

It is not a de Polignac number, because 28952309 - 2⁴ = 28952293 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 (28952909) 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, 348782 + ... + 348864.

It is an arithmetic number, because the mean of its divisors is an integer number (1973160).

Almost surely, 2^28952309 is an apocalyptic number.

It is an amenable number.

28952309 is a deficient number, since it is larger than the sum of its proper divisors (2618251).

28952309 is an frugal number, since it uses more digits than its factorization.

With its predecessor (28952308) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (171).

28952309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 28952309 is about 5380.7349869697. The cubic root of 28952309 is about 307.0631742301.

The spelling of 28952309 in words is "twenty-eight million, nine hundred fifty-two thousand, three hundred nine".