28647801 has 72 divisors (see below), whose sum is σ = 54774720. Its totient is φ = 14261184.

The previous prime is 28647799. The next prime is 28647803. The reversal of 28647801 is 10874682.

28647801 is a `hidden beast` number, since 2 + 8 + 647 + 8 + 0 + 1 = 666.

28647801 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (28647799) and next prime (28647803).

It is not a de Polignac number, because 28647801 - 2¹ = 28647799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28647803) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 108796 + ... + 109058.

It is an arithmetic number, because the mean of its divisors is an integer number (760760).

Almost surely, 2^28647801 is an apocalyptic number.

28647801 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28647801 is a deficient number, since it is larger than the sum of its proper divisors (26126919).

28647801 is a wasteful number, since it uses less digits than its factorization.

28647801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 305 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28647801 is about 5352.3640571247. The cubic root of 28647801 is about 305.9828581965.

The spelling of 28647801 in words is "twenty-eight million, six hundred forty-seven thousand, eight hundred one".