28477520 has 20 divisors (see below), whose sum is σ = 66210420. Its totient is φ = 11390976.

The previous prime is 28477489. The next prime is 28477529. The reversal of 28477520 is 2577482.

It can be written as a sum of positive squares in 2 ways, for example, as 10601536 + 17875984 = 3256^2 + 4228^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477529) 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, 177905 + ... + 178064.

It is an arithmetic number, because the mean of its divisors is an integer number (3310521).

Almost surely, 2^28477520 is an apocalyptic number.

28477520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28477520 is an abundant number, since it is smaller than the sum of its proper divisors (37732900).

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

28477520 is a wasteful number, since it uses less digits than its factorization.

28477520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355982 (or 355976 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 28477520 is about 5336.4332657684. The cubic root of 28477520 is about 305.3754044523.

The spelling of 28477520 in words is "twenty-eight million, four hundred seventy-seven thousand, five hundred twenty".