28404144 has 120 divisors (see below), whose sum is σ = 86525712. Its totient is φ = 8663040.

The previous prime is 28404143. The next prime is 28404169. The reversal of 28404144 is 44140482.

28404144 = T₁₄₃₇ + T₁₄₃₈ + ... + T₁₄₆₃.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28404143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100227 + ... + 100509.

Almost surely, 2^28404144 is an apocalyptic number.

28404144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28404144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43262856).

28404144 is an abundant number, since it is smaller than the sum of its proper divisors (58121568).

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

28404144 is a wasteful number, since it uses less digits than its factorization.

28404144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 346 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 28404144 is about 5329.5538274794. The cubic root of 28404144 is about 305.1128991696.

The spelling of 28404144 in words is "twenty-eight million, four hundred four thousand, one hundred forty-four".