28573640 has 16 divisors (see below), whose sum is σ = 64290780. Its totient is φ = 11429440.

The previous prime is 28573627. The next prime is 28573667. The reversal of 28573640 is 4637582.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 24661156 + 3912484 = 4966^2 + 1978^2 .

It is a super-3 number, since 3×28573640³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28573640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357131 + ... + 357210.

Almost surely, 2^28573640 is an apocalyptic number.

28573640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28573640 is an abundant number, since it is smaller than the sum of its proper divisors (35717140).

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

28573640 is a wasteful number, since it uses less digits than its factorization.

28573640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 714352 (or 714348 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 28573640 is about 5345.4316944471. The cubic root of 28573640 is about 305.7185958657.

The spelling of 28573640 in words is "twenty-eight million, five hundred seventy-three thousand, six hundred forty".