28071144 has 32 divisors (see below), whose sum is σ = 77976000. Its totient is φ = 9356976.

The previous prime is 28071119. The next prime is 28071187. The reversal of 28071144 is 44117082.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64764 + ... + 65195.

It is an arithmetic number, because the mean of its divisors is an integer number (2436750).

Almost surely, 2^28071144 is an apocalyptic number.

28071144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28071144 is an abundant number, since it is smaller than the sum of its proper divisors (49904856).

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

28071144 is a wasteful number, since it uses less digits than its factorization.

28071144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129974 (or 129964 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 28071144 is about 5298.2208334497. The cubic root of 28071144 is about 303.9158642974.

The spelling of 28071144 in words is "twenty-eight million, seventy-one thousand, one hundred forty-four".