28303732 has 6 divisors (see below), whose sum is σ = 49531538. Its totient is φ = 14151864.

The previous prime is 28303687. The next prime is 28303733. The reversal of 28303732 is 23730382.

It can be written as a sum of positive squares in only one way, i.e., 22524516 + 5779216 = 4746^2 + 2404^2 .

It is a super-2 number, since 2×28303732² = 1602202490255648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28303732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28303733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3537963 + ... + 3537970.

Almost surely, 2^28303732 is an apocalyptic number.

It is an amenable number.

28303732 is a deficient number, since it is larger than the sum of its proper divisors (21227806).

28303732 is a wasteful number, since it uses less digits than its factorization.

28303732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7075937 (or 7075935 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 28303732 is about 5320.1251864970. The cubic root of 28303732 is about 304.7529379694.

The spelling of 28303732 in words is "twenty-eight million, three hundred three thousand, seven hundred thirty-two".