28772520 has 64 divisors (see below), whose sum is σ = 98651520. Its totient is φ = 6576384.

The previous prime is 28772519. The next prime is 28772521. The reversal of 28772520 is 2527782.

It is an interprime number because it is at equal distance from previous prime (28772519) and next prime (28772521).

It is not an unprimeable number, because it can be changed into a prime (28772521) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 16287 + ... + 17966.

It is an arithmetic number, because the mean of its divisors is an integer number (1541430).

Almost surely, 2^28772520 is an apocalyptic number.

28772520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28772520 is an abundant number, since it is smaller than the sum of its proper divisors (69879000).

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

28772520 is a wasteful number, since it uses less digits than its factorization.

28772520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34274 (or 34270 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 28772520 is about 5364.0022371360. The cubic root of 28772520 is about 306.4262503443.

It can be divided in two parts, 28772 and 520, that added together give a palindrome (29292).

The spelling of 28772520 in words is "twenty-eight million, seven hundred seventy-two thousand, five hundred twenty".