28404442 has 8 divisors (see below), whose sum is σ = 46480032. Its totient is φ = 12911100.

The previous prime is 28404407. The next prime is 28404451. The reversal of 28404442 is 24440482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28404442.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645534 + ... + 645577.

It is an arithmetic number, because the mean of its divisors is an integer number (5810004).

Almost surely, 2^28404442 is an apocalyptic number.

28404442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28404442 is a deficient number, since it is larger than the sum of its proper divisors (18075590).

28404442 is a wasteful number, since it uses less digits than its factorization.

28404442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291124.

The product of its (nonzero) digits is 8192, while the sum is 28.

The square root of 28404442 is about 5329.5817847182. The cubic root of 28404442 is about 305.1139661891.

The spelling of 28404442 in words is "twenty-eight million, four hundred four thousand, four hundred forty-two".