28591240 has 16 divisors (see below), whose sum is σ = 64330380. Its totient is φ = 11436480.

The previous prime is 28591237. The next prime is 28591243. The reversal of 28591240 is 4219582.

It is an interprime number because it is at equal distance from previous prime (28591237) and next prime (28591243).

It can be written as a sum of positive squares in 2 ways, for example, as 26811684 + 1779556 = 5178^2 + 1334^2 .

It is not an unprimeable number, because it can be changed into a prime (28591243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357351 + ... + 357430.

Almost surely, 2^28591240 is an apocalyptic number.

28591240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28591240 is an abundant number, since it is smaller than the sum of its proper divisors (35739140).

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

28591240 is a wasteful number, since it uses less digits than its factorization.

28591240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714792 (or 714788 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28591240 is about 5347.0777065608. The cubic root of 28591240 is about 305.7813523424.

The spelling of 28591240 in words is "twenty-eight million, five hundred ninety-one thousand, two hundred forty".