28791632 has 10 divisors (see below), whose sum is σ = 55783818. Its totient is φ = 14395808.

The previous prime is 28791619. The next prime is 28791643. The reversal of 28791632 is 23619782.

It can be written as a sum of positive squares in only one way, i.e., 22052416 + 6739216 = 4696^2 + 2596^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 899723 + ... + 899754.

Almost surely, 2^28791632 is an apocalyptic number.

It is an amenable number.

28791632 is a deficient number, since it is larger than the sum of its proper divisors (26992186).

28791632 is a wasteful number, since it uses less digits than its factorization.

28791632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799485 (or 1799479 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 28791632 is about 5365.7834469908. The cubic root of 28791632 is about 306.4940826866.

It can be divided in two parts, 287 and 91632, that added together give a palindrome (91919).

The spelling of 28791632 in words is "twenty-eight million, seven hundred ninety-one thousand, six hundred thirty-two".