28011040 has 24 divisors (see below), whose sum is σ = 66176460. Its totient is φ = 11204352.

The previous prime is 28011031. The next prime is 28011091. The reversal of 28011040 is 4011082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28005264 + 5776 = 5292^2 + 76^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87375 + ... + 87694.

Almost surely, 2^28011040 is an apocalyptic number.

28011040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28011040 is an abundant number, since it is smaller than the sum of its proper divisors (38165420).

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

28011040 is a wasteful number, since it uses less digits than its factorization.

28011040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175084 (or 175076 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 28011040 is about 5292.5457012670. The cubic root of 28011040 is about 303.6988013985.

The spelling of 28011040 in words is "twenty-eight million, eleven thousand, forty".