28717040 has 40 divisors (see below), whose sum is σ = 72839088. Its totient is φ = 10442240.

The previous prime is 28717021. The next prime is 28717079. The reversal of 28717040 is 4071782.

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

It is a junction number, because it is equal to n+sod(n) for n = 28716994 and 28717012.

It is a congruent number.

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, 15437 + ... + 17196.

Almost surely, 2^28717040 is an apocalyptic number.

28717040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28717040 is an abundant number, since it is smaller than the sum of its proper divisors (44122048).

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

28717040 is a wasteful number, since it uses less digits than its factorization.

28717040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32657 (or 32651 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 28717040 is about 5358.8282301264. The cubic root of 28717040 is about 306.2291703173.

The spelling of 28717040 in words is "twenty-eight million, seven hundred seventeen thousand, forty".