28180942 has 4 divisors (see below), whose sum is σ = 42271416. Its totient is φ = 14090470.

The previous prime is 28180931. The next prime is 28180967. The reversal of 28180942 is 24908182.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 28180898 and 28180907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7045234 + ... + 7045237.

It is an arithmetic number, because the mean of its divisors is an integer number (10567854).

Almost surely, 2^28180942 is an apocalyptic number.

28180942 is a deficient number, since it is larger than the sum of its proper divisors (14090474).

28180942 is a wasteful number, since it uses less digits than its factorization.

28180942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14090473.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 28180942 is about 5308.5725011532. The cubic root of 28180942 is about 304.3115961943.

The spelling of 28180942 in words is "twenty-eight million, one hundred eighty thousand, nine hundred forty-two".