28071140 has 12 divisors (see below), whose sum is σ = 58949436. Its totient is φ = 11228448.

The previous prime is 28071119. The next prime is 28071187. The reversal of 28071140 is 4117082.

It can be written as a sum of positive squares in 2 ways, for example, as 19166884 + 8904256 = 4378^2 + 2984^2 .

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, 701759 + ... + 701798.

It is an arithmetic number, because the mean of its divisors is an integer number (4912453).

Almost surely, 2^28071140 is an apocalyptic number.

28071140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28071140 is an abundant number, since it is smaller than the sum of its proper divisors (30878296).

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

28071140 is a wasteful number, since it uses less digits than its factorization.

28071140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403566 (or 1403564 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 28071140 is about 5298.2204559644. The cubic root of 28071140 is about 303.9158498619.

The spelling of 28071140 in words is "twenty-eight million, seventy-one thousand, one hundred forty".