28973830 has 24 divisors (see below), whose sum is σ = 53428032. Its totient is φ = 11312784.

The previous prime is 28973771. The next prime is 28973837. The reversal of 28973830 is 3837982.

It is a happy number.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28973837) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17707 + ... + 19273.

It is an arithmetic number, because the mean of its divisors is an integer number (2226168).

Almost surely, 2^28973830 is an apocalyptic number.

28973830 is a deficient number, since it is larger than the sum of its proper divisors (24454202).

28973830 is a wasteful number, since it uses less digits than its factorization.

28973830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28973830 is about 5382.7344352104. The cubic root of 28973830 is about 307.1392380526.

The spelling of 28973830 in words is "twenty-eight million, nine hundred seventy-three thousand, eight hundred thirty".