28485040 has 80 divisors (see below), whose sum is σ = 70227648. Its totient is φ = 10723328.

The previous prime is 28485029. The next prime is 28485043. The reversal of 28485040 is 4058482.

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

It is a super-2 number, since 2×28485040² = 1622795007603200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28484993 and 28485011.

It is not an unprimeable number, because it can be changed into a prime (28485043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207852 + ... + 207988.

Almost surely, 2^28485040 is an apocalyptic number.

28485040 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 28485040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35113824).

28485040 is an abundant number, since it is smaller than the sum of its proper divisors (41742608).

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

28485040 is a wasteful number, since it uses less digits than its factorization.

28485040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28485040 is about 5337.1378097254. The cubic root of 28485040 is about 305.4022820377.

The spelling of 28485040 in words is "twenty-eight million, four hundred eighty-five thousand, forty".