28635520 has 64 divisors (see below), whose sum is σ = 69290640. Its totient is φ = 11315200.

The previous prime is 28635517. The next prime is 28635533. The reversal of 28635520 is 2553682.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64419 + ... + 64861.

Almost surely, 2^28635520 is an apocalyptic number.

28635520 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 28635520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34645320).

28635520 is an abundant number, since it is smaller than the sum of its proper divisors (40655120).

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

28635520 is a wasteful number, since it uses less digits than its factorization.

28635520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 28635520 is about 5351.2166840822. The cubic root of 28635520 is about 305.9391281084.

The spelling of 28635520 in words is "twenty-eight million, six hundred thirty-five thousand, five hundred twenty".