28688550 has 48 divisors (see below), whose sum is σ = 77620032. Its totient is φ = 6954400.

The previous prime is 28688533. The next prime is 28688557. The reversal of 28688550 is 5588682.

It is a super-2 number, since 2×28688550² = 1646065802205000, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7044 + ... + 10343.

It is an arithmetic number, because the mean of its divisors is an integer number (1617084).

Almost surely, 2^28688550 is an apocalyptic number.

28688550 is an abundant number, since it is smaller than the sum of its proper divisors (48931482).

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

28688550 is a wasteful number, since it uses less digits than its factorization.

28688550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17413 (or 17408 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 28688550 is about 5356.1693401161. The cubic root of 28688550 is about 306.1278674460.

The spelling of 28688550 in words is "twenty-eight million, six hundred eighty-eight thousand, five hundred fifty".