28477642 has 24 divisors (see below), whose sum is σ = 45040716. Its totient is φ = 13493376.

The previous prime is 28477621. The next prime is 28477643. The reversal of 28477642 is 24677482.

It can be written as a sum of positive squares in 6 ways, for example, as 26224641 + 2253001 = 5121^2 + 1501^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28477595 and 28477604.

It is not an unprimeable number, because it can be changed into a prime (28477643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 207798 + ... + 207934.

Almost surely, 2^28477642 is an apocalyptic number.

28477642 is a deficient number, since it is larger than the sum of its proper divisors (16563074).

28477642 is a wasteful number, since it uses less digits than its factorization.

28477642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282 (or 229 counting only the distinct ones).

The product of its digits is 150528, while the sum is 40.

The square root of 28477642 is about 5336.4446966122. Note that the first 3 decimals coincide. The cubic root of 28477642 is about 305.3758405360.

The spelling of 28477642 in words is "twenty-eight million, four hundred seventy-seven thousand, six hundred forty-two".