28449894 has 32 divisors (see below), whose sum is σ = 62383104. Its totient is φ = 8578080.

The previous prime is 28449893. The next prime is 28449907. The reversal of 28449894 is 49894482.

It is a super-2 number, since 2×28449894² = 1618792937222472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28449893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13752 + ... + 15684.

It is an arithmetic number, because the mean of its divisors is an integer number (1949472).

Almost surely, 2^28449894 is an apocalyptic number.

28449894 is an abundant number, since it is smaller than the sum of its proper divisors (33933210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28449894 is a wasteful number, since it uses less digits than its factorization.

28449894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172.

The product of its digits is 663552, while the sum is 48.

The square root of 28449894 is about 5333.8442046989. The cubic root of 28449894 is about 305.2766244273.

The spelling of 28449894 in words is "twenty-eight million, four hundred forty-nine thousand, eight hundred ninety-four".