28654909 has 12 divisors (see below), whose sum is σ = 30124956. Its totient is φ = 27231552.

The previous prime is 28654897. The next prime is 28654919. The reversal of 28654909 is 90945682.

It can be written as a sum of positive squares in 2 ways, for example, as 21483225 + 7171684 = 4635^2 + 2678^2 .

It is not a de Polignac number, because 28654909 - 2⁷ = 28654781 is a prime.

It is a super-2 number, since 2×28654909² = 1642207619596562, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28654919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 278152 + ... + 278254.

It is an arithmetic number, because the mean of its divisors is an integer number (2510413).

Almost surely, 2^28654909 is an apocalyptic number.

It is an amenable number.

28654909 is a deficient number, since it is larger than the sum of its proper divisors (1470047).

28654909 is an equidigital number, since it uses as much as digits as its factorization.

28654909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 213 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 28654909 is about 5353.0280215967. The cubic root of 28654909 is about 306.0081625971.

The spelling of 28654909 in words is "twenty-eight million, six hundred fifty-four thousand, nine hundred nine".