28647390 has 64 divisors (see below), whose sum is σ = 70926336. Its totient is φ = 7402752.

The previous prime is 28647373. The next prime is 28647403. The reversal of 28647390 is 9374682.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225507 + ... + 225633.

It is an arithmetic number, because the mean of its divisors is an integer number (1108224).

Almost surely, 2^28647390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28647390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35463168).

28647390 is an abundant number, since it is smaller than the sum of its proper divisors (42278946).

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

28647390 is a wasteful number, since it uses less digits than its factorization.

28647390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 28647390 is about 5352.3256627376. The cubic root of 28647390 is about 305.9813949131.

The spelling of 28647390 in words is "twenty-eight million, six hundred forty-seven thousand, three hundred ninety".