28709514 has 24 divisors (see below), whose sum is σ = 62302500. Its totient is φ = 9554688.

The previous prime is 28709453. The next prime is 28709519. The reversal of 28709514 is 41590782.

It can be written as a sum of positive squares in 2 ways, for example, as 28676025 + 33489 = 5355^2 + 183^2 .

It is not an unprimeable number, because it can be changed into a prime (28709519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21844 + ... + 23120.

Almost surely, 2^28709514 is an apocalyptic number.

28709514 is an abundant number, since it is smaller than the sum of its proper divisors (33592986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28709514 is a wasteful number, since it uses less digits than its factorization.

28709514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534 (or 2531 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28709514 is about 5358.1259783622. The cubic root of 28709514 is about 306.2024163749.

The spelling of 28709514 in words is "twenty-eight million, seven hundred nine thousand, five hundred fourteen".