28935639 has 6 divisors (see below), whose sum is σ = 41795936. Its totient is φ = 19290420.

The previous prime is 28935637. The next prime is 28935653. The reversal of 28935639 is 93653982.

28935639 is a `hidden beast` number, since 2 + 8 + 9 + 3 + 5 + 639 = 666.

It is not a de Polignac number, because 28935639 - 2¹ = 28935637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28935594 and 28935603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28935631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1607527 + ... + 1607544.

Almost surely, 2^28935639 is an apocalyptic number.

28935639 is a deficient number, since it is larger than the sum of its proper divisors (12860297).

28935639 is a wasteful number, since it uses less digits than its factorization.

28935639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3215077 (or 3215074 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 28935639 is about 5379.1857190471. The cubic root of 28935639 is about 307.0042298717.

The spelling of 28935639 in words is "twenty-eight million, nine hundred thirty-five thousand, six hundred thirty-nine".