28520330 has 16 divisors (see below), whose sum is σ = 54038880. Its totient is φ = 10807632.

The previous prime is 28520329. The next prime is 28520353. The reversal of 28520330 is 3302582.

It is a junction number, because it is equal to n+sod(n) for n = 28520296 and 28520305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74864 + ... + 75243.

It is an arithmetic number, because the mean of its divisors is an integer number (3377430).

Almost surely, 2^28520330 is an apocalyptic number.

28520330 is a deficient number, since it is larger than the sum of its proper divisors (25518550).

28520330 is a wasteful number, since it uses less digits than its factorization.

28520330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150133.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 28520330 is about 5340.4428655309. The cubic root of 28520330 is about 305.5283505378.

The spelling of 28520330 in words is "twenty-eight million, five hundred twenty thousand, three hundred thirty".