28457642 has 16 divisors (see below), whose sum is σ = 44301600. Its totient is φ = 13693680.

The previous prime is 28457641. The next prime is 28457669. The reversal of 28457642 is 24675482.

It is a junction number, because it is equal to n+sod(n) for n = 28457596 and 28457605.

It is not an unprimeable number, because it can be changed into a prime (28457641) 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 7 ways as a sum of consecutive naturals, for example, 23717 + ... + 24887.

It is an arithmetic number, because the mean of its divisors is an integer number (2768850).

Almost surely, 2^28457642 is an apocalyptic number.

28457642 is a deficient number, since it is larger than the sum of its proper divisors (15843958).

28457642 is a wasteful number, since it uses less digits than its factorization.

28457642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621.

The product of its digits is 107520, while the sum is 38.

The square root of 28457642 is about 5334.5704606838. The cubic root of 28457642 is about 305.3043347660.

The spelling of 28457642 in words is "twenty-eight million, four hundred fifty-seven thousand, six hundred forty-two".