28493040 has 80 divisors (see below), whose sum is σ = 88887168. Its totient is φ = 7550208.

The previous prime is 28493033. The next prime is 28493053. The reversal of 28493040 is 4039482.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28492989 and 28493007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54219 + ... + 54741.

Almost surely, 2^28493040 is an apocalyptic number.

28493040 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 28493040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44443584).

28493040 is an abundant number, since it is smaller than the sum of its proper divisors (60394128).

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

28493040 is a wasteful number, since it uses less digits than its factorization.

28493040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28493040 is about 5337.8872224879. The cubic root of 28493040 is about 305.4308700213.

The spelling of 28493040 in words is "twenty-eight million, four hundred ninety-three thousand, forty".