28440446 has 8 divisors (see below), whose sum is σ = 42844464. Its totient is φ = 14158960.

The previous prime is 28440427. The next prime is 28440449. The reversal of 28440446 is 64404482.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30050 + ... + 30981.

It is an arithmetic number, because the mean of its divisors is an integer number (5355558).

Almost surely, 2^28440446 is an apocalyptic number.

28440446 is a deficient number, since it is larger than the sum of its proper divisors (14404018).

28440446 is a wasteful number, since it uses less digits than its factorization.

28440446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61266.

The product of its (nonzero) digits is 24576, while the sum is 32.

The square root of 28440446 is about 5332.9584659924. The cubic root of 28440446 is about 305.2428273138.

It can be divided in two parts, 2 and 8440446, that added together give a palindrome (8440448).

The spelling of 28440446 in words is "twenty-eight million, four hundred forty thousand, four hundred forty-six".