28797040 has 40 divisors (see below), whose sum is σ = 67884048. Its totient is φ = 11358720.

The previous prime is 28797023. The next prime is 28797053. The reversal of 28797040 is 4079782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3375 + ... + 8305.

Almost surely, 2^28797040 is an apocalyptic number.

28797040 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 28797040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33942024).

28797040 is an abundant number, since it is smaller than the sum of its proper divisors (39087008).

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

28797040 is a wasteful number, since it uses less digits than its factorization.

28797040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017 (or 5011 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28797040 is about 5366.2873571958. The cubic root of 28797040 is about 306.5132713202.

The spelling of 28797040 in words is "twenty-eight million, seven hundred ninety-seven thousand, forty".