28811642 has 16 divisors (see below), whose sum is σ = 44268000. Its totient is φ = 14059440.

The previous prime is 28811623. The next prime is 28811659. The reversal of 28811642 is 24611882.

It is a happy number.

It is a super-2 number, since 2×28811642² = 1660221429472328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28811599 and 28811608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16109 + ... + 17807.

It is an arithmetic number, because the mean of its divisors is an integer number (2766750).

Almost surely, 2^28811642 is an apocalyptic number.

28811642 is a deficient number, since it is larger than the sum of its proper divisors (15456358).

28811642 is a wasteful number, since it uses less digits than its factorization.

28811642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its digits is 6144, while the sum is 32.

The square root of 28811642 is about 5367.6477157131. The cubic root of 28811642 is about 306.5650700526.

The spelling of 28811642 in words is "twenty-eight million, eight hundred eleven thousand, six hundred forty-two".