28572011 has 4 divisors (see below), whose sum is σ = 30769872. Its totient is φ = 26374152.

The previous prime is 28572001. The next prime is 28572073. The reversal of 28572011 is 11027582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28572011 - 2⁶ = 28571947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28572001) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1098911 + ... + 1098936.

It is an arithmetic number, because the mean of its divisors is an integer number (7692468).

Almost surely, 2^28572011 is an apocalyptic number.

28572011 is a deficient number, since it is larger than the sum of its proper divisors (2197861).

28572011 is a wasteful number, since it uses less digits than its factorization.

28572011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197860.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28572011 is about 5345.2793191750. The cubic root of 28572011 is about 305.7127860230.

Adding to 28572011 its reverse (11027582), we get a palindrome (39599593).

The spelling of 28572011 in words is "twenty-eight million, five hundred seventy-two thousand, eleven".