28006930 has 48 divisors (see below), whose sum is σ = 59668056. Its totient is φ = 9434880.

The previous prime is 28006897. The next prime is 28006967. The reversal of 28006930 is 3960082.

It can be written as a sum of positive squares in 4 ways, for example, as 7112889 + 20894041 = 2667^2 + 4571^2 .

28006930 is a modest number, since divided by 6930 gives 2800 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29422 + ... + 30358.

Almost surely, 2^28006930 is an apocalyptic number.

28006930 is an abundant number, since it is smaller than the sum of its proper divisors (31661126).

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

28006930 is a wasteful number, since it uses less digits than its factorization.

28006930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28006930 is about 5292.1574050665. The cubic root of 28006930 is about 303.6839469801.

It can be divided in two parts, 2800 and 6930, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 28006930 in words is "twenty-eight million, six thousand, nine hundred thirty".