28397040 has 80 divisors (see below), whose sum is σ = 100612608. Its totient is φ = 6490368.

The previous prime is 28397027. The next prime is 28397053. The reversal of 28397040 is 4079382.

It is an interprime number because it is at equal distance from previous prime (28397027) and next prime (28397053).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 28396992 and 28397010.

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 15 ways as a sum of consecutive naturals, for example, 6772 + ... + 10131.

Almost surely, 2^28397040 is an apocalyptic number.

28397040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28397040 is an abundant number, since it is smaller than the sum of its proper divisors (72215568).

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

28397040 is a wasteful number, since it uses less digits than its factorization.

28397040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16926 (or 16920 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28397040 is about 5328.8873135018. The cubic root of 28397040 is about 305.0874603609.

The spelling of 28397040 in words is "twenty-eight million, three hundred ninety-seven thousand, forty".