28604642 has 36 divisors (see below), whose sum is σ = 50222130. Its totient is φ = 12207360.

The previous prime is 28604627. The next prime is 28604647. The reversal of 28604642 is 24640682.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 27994681 + 609961 = 5291^2 + 781^2 .

It is a super-3 number, since 3×28604642³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28604599 and 28604608.

It is not an unprimeable number, because it can be changed into a prime (28604647) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 69734 + ... + 70142.

Almost surely, 2^28604642 is an apocalyptic number.

28604642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28604642 is a deficient number, since it is larger than the sum of its proper divisors (21617488).

28604642 is a wasteful number, since it uses less digits than its factorization.

28604642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 439 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 28604642 is about 5348.3307676321. The cubic root of 28604642 is about 305.8291227030.

The spelling of 28604642 in words is "twenty-eight million, six hundred four thousand, six hundred forty-two".