28893840 has 40 divisors (see below), whose sum is σ = 89571648. Its totient is φ = 7704960.

The previous prime is 28893833. The next prime is 28893847. The reversal of 28893840 is 4839882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28893833) and next prime (28893847).

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 = 28893792 and 28893801.

It is not an unprimeable number, because it can be changed into a prime (28893847) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 59956 + ... + 60435.

Almost surely, 2^28893840 is an apocalyptic number.

28893840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28893840 is an abundant number, since it is smaller than the sum of its proper divisors (60677808).

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

28893840 is a wasteful number, since it uses less digits than its factorization.

28893840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120407 (or 120401 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 28893840 is about 5375.2990614477. The cubic root of 28893840 is about 306.8563308993.

The spelling of 28893840 in words is "twenty-eight million, eight hundred ninety-three thousand, eight hundred forty".