28013040 has 240 divisors, whose sum is σ = 107243136. Its totient is φ = 6739200.

The previous prime is 28013009. The next prime is 28013053. The reversal of 28013040 is 4031082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 213775 + ... + 213905.

Almost surely, 2^28013040 is an apocalyptic number.

28013040 is a gapful number since it is divisible by the number (20) 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 28013040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53621568).

28013040 is an abundant number, since it is smaller than the sum of its proper divisors (79230096).

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

28013040 is a wasteful number, since it uses less digits than its factorization.

28013040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 28013040 is about 5292.7346428855. The cubic root of 28013040 is about 303.7060293004.

The spelling of 28013040 in words is "twenty-eight million, thirteen thousand, forty".