28661332 has 24 divisors (see below), whose sum is σ = 57854720. Its totient is φ = 12169440.

The previous prime is 28661323. The next prime is 28661357. The reversal of 28661332 is 23316682.

It is a junction number, because it is equal to n+sod(n) for n = 28661294 and 28661303.

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 in 7 ways as a sum of consecutive naturals, for example, 1644 + ... + 7747.

Almost surely, 2^28661332 is an apocalyptic number.

It is an amenable number.

28661332 is an abundant number, since it is smaller than the sum of its proper divisors (29193388).

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

28661332 is a wasteful number, since it uses less digits than its factorization.

28661332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9511 (or 9509 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 28661332 is about 5353.6279287974. The cubic root of 28661332 is about 306.0310248066.

The spelling of 28661332 in words is "twenty-eight million, six hundred sixty-one thousand, three hundred thirty-two".