28611801 has 9 divisors (see below), whose sum is σ = 41351349. Its totient is φ = 19063836.

The previous prime is 28611787. The next prime is 28611823. The reversal of 28611801 is 10811682.

The square root of 28611801 is 5349.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 28611801 - 2⁵ = 28611769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28611851) 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 8 ways as a sum of consecutive naturals, for example, 15156 + ... + 16938.

Almost surely, 2^28611801 is an apocalyptic number.

28611801 is the 5349-th square number.

28611801 is the 2675-th centered octagonal number.

It is an amenable number.

28611801 is a deficient number, since it is larger than the sum of its proper divisors (12739548).

28611801 is an frugal number, since it uses more digits than its factorization.

28611801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The cubic root of 28611801 is about 305.8546342740.

The spelling of 28611801 in words is "twenty-eight million, six hundred eleven thousand, eight hundred one".