28720475733 has 32 divisors (see below), whose sum is σ = 41027890176. Its totient is φ = 17807966208.

The previous prime is 28720475723. The next prime is 28720475741. The reversal of 28720475733 is 33757402782.

It is not a de Polignac number, because 28720475733 - 2⁸ = 28720475477 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28720475723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1548885 + ... + 1567317.

It is an arithmetic number, because the mean of its divisors is an integer number (1282121568).

Almost surely, 2^28720475733 is an apocalyptic number.

It is an amenable number.

28720475733 is a deficient number, since it is larger than the sum of its proper divisors (12307414443).

28720475733 is a wasteful number, since it uses less digits than its factorization.

28720475733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18813.

The product of its (nonzero) digits is 1975680, while the sum is 48.

The spelling of 28720475733 in words is "twenty-eight billion, seven hundred twenty million, four hundred seventy-five thousand, seven hundred thirty-three".