28628550 has 72 divisors (see below), whose sum is σ = 77733864. Its totient is φ = 7553280.

The previous prime is 28628519. The next prime is 28628591. The reversal of 28628550 is 5582682.

28628550 is a `hidden beast` number, since 2 + 86 + 28 + 550 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50569 + ... + 51131.

It is an arithmetic number, because the mean of its divisors is an integer number (1079637).

Almost surely, 2^28628550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28628550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38866932).

28628550 is an abundant number, since it is smaller than the sum of its proper divisors (49105314).

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

28628550 is a wasteful number, since it uses less digits than its factorization.

28628550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 686 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 28628550 is about 5350.5653906854. The cubic root of 28628550 is about 305.9143038254.

The spelling of 28628550 in words is "twenty-eight million, six hundred twenty-eight thousand, five hundred fifty".