28211332 has 6 divisors (see below), whose sum is σ = 49369838. Its totient is φ = 14105664.

The previous prime is 28211303. The next prime is 28211377. The reversal of 28211332 is 23311282.

It can be written as a sum of positive squares in only one way, i.e., 23951236 + 4260096 = 4894^2 + 2064^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3526413 + ... + 3526420.

Almost surely, 2^28211332 is an apocalyptic number.

It is an amenable number.

28211332 is a deficient number, since it is larger than the sum of its proper divisors (21158506).

28211332 is a wasteful number, since it uses less digits than its factorization.

28211332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7052837 (or 7052835 counting only the distinct ones).

The product of its digits is 576, while the sum is 22.

The square root of 28211332 is about 5311.4340813005. The cubic root of 28211332 is about 304.4209455917.

The spelling of 28211332 in words is "twenty-eight million, two hundred eleven thousand, three hundred thirty-two".