28278632 has 8 divisors (see below), whose sum is σ = 53022450. Its totient is φ = 14139312.

The previous prime is 28278617. The next prime is 28278671. The reversal of 28278632 is 23687282.

It can be written as a sum of positive squares in only one way, i.e., 25542916 + 2735716 = 5054^2 + 1654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1767407 + ... + 1767422.

Almost surely, 2^28278632 is an apocalyptic number.

It is an amenable number.

28278632 is a deficient number, since it is larger than the sum of its proper divisors (24743818).

28278632 is a wasteful number, since it uses less digits than its factorization.

28278632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3534835 (or 3534831 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 28278632 is about 5317.7656962299. The cubic root of 28278632 is about 304.6628254592.

The spelling of 28278632 in words is "twenty-eight million, two hundred seventy-eight thousand, six hundred thirty-two".