28528540 has 12 divisors (see below), whose sum is σ = 59909976. Its totient is φ = 11411408.

The previous prime is 28528537. The next prime is 28528543. The reversal of 28528540 is 4582582.

It is an interprime number because it is at equal distance from previous prime (28528537) and next prime (28528543).

It is a junction number, because it is equal to n+sod(n) for n = 28528496 and 28528505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528543) 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, 713194 + ... + 713233.

It is an arithmetic number, because the mean of its divisors is an integer number (4992498).

Almost surely, 2^28528540 is an apocalyptic number.

28528540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28528540 is an abundant number, since it is smaller than the sum of its proper divisors (31381436).

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

28528540 is a wasteful number, since it uses less digits than its factorization.

28528540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426436 (or 1426434 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 28528540 is about 5341.2114730649. The cubic root of 28528540 is about 305.5576646809.

The spelling of 28528540 in words is "twenty-eight million, five hundred twenty-eight thousand, five hundred forty".