28709135 has 16 divisors (see below), whose sum is σ = 42401856. Its totient is φ = 18171648.

The previous prime is 28709113. The next prime is 28709173. The reversal of 28709135 is 53190782.

It is a cyclic number.

It is not a de Polignac number, because 28709135 - 2⁶ = 28709071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a junction number, because it is equal to n+sod(n) for n = 28709095 and 28709104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31094 + ... + 32003.

It is an arithmetic number, because the mean of its divisors is an integer number (2650116).

Almost surely, 2^28709135 is an apocalyptic number.

28709135 is a deficient number, since it is larger than the sum of its proper divisors (13692721).

28709135 is a wasteful number, since it uses less digits than its factorization.

28709135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63122.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 28709135 is about 5358.0906114025. The cubic root of 28709135 is about 306.2010689560.

The spelling of 28709135 in words is "twenty-eight million, seven hundred nine thousand, one hundred thirty-five".