28403946 has 20 divisors (see below), whose sum is σ = 63646242. Its totient is φ = 9467928.

The previous prime is 28403929. The next prime is 28403959. The reversal of 28403946 is 64930482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 11634921 = 4095^2 + 3411^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28403946.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 87505 + ... + 87828.

Almost surely, 2^28403946 is an apocalyptic number.

28403946 is an abundant number, since it is smaller than the sum of its proper divisors (35242296).

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

28403946 is a wasteful number, since it uses less digits than its factorization.

28403946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175347 (or 175338 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 28403946 is about 5329.5352517832. The cubic root of 28403946 is about 305.1121902063.

It can be divided in two parts, 2840 and 3946, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 28403946 in words is "twenty-eight million, four hundred three thousand, nine hundred forty-six".