28509435 has 32 divisors (see below), whose sum is σ = 50964480. Its totient is φ = 15120864.

The previous prime is 28509431. The next prime is 28509457. The reversal of 28509435 is 53490582.

It is not a de Polignac number, because 28509435 - 2² = 28509431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28509435.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28509431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29632 + ... + 30578.

It is an arithmetic number, because the mean of its divisors is an integer number (1592640).

Almost surely, 2^28509435 is an apocalyptic number.

28509435 is a deficient number, since it is larger than the sum of its proper divisors (22455045).

28509435 is a wasteful number, since it uses less digits than its factorization.

28509435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 28509435 is about 5339.4227216058. The cubic root of 28509435 is about 305.4894408041.

The spelling of 28509435 in words is "twenty-eight million, five hundred nine thousand, four hundred thirty-five".