28772403 has 32 divisors (see below), whose sum is σ = 44563200. Its totient is φ = 16329600.

The previous prime is 28772389. The next prime is 28772453. The reversal of 28772403 is 30427782.

It is not a de Polignac number, because 28772403 - 2⁶ = 28772339 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28772453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68133 + ... + 68553.

It is an arithmetic number, because the mean of its divisors is an integer number (1392600).

Almost surely, 2^28772403 is an apocalyptic number.

28772403 is a deficient number, since it is larger than the sum of its proper divisors (15790797).

28772403 is a wasteful number, since it uses less digits than its factorization.

28772403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 28772403 is about 5363.9913310892. The cubic root of 28772403 is about 306.4258349952.

The spelling of 28772403 in words is "twenty-eight million, seven hundred seventy-two thousand, four hundred three".