28572101 has 4 divisors (see below), whose sum is σ = 28697100. Its totient is φ = 28447104.

The previous prime is 28572077. The next prime is 28572109. The reversal of 28572101 is 10127582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23049601 + 5522500 = 4801^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 28572101 - 2¹⁰ = 28571077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28572109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62156 + ... + 62613.

It is an arithmetic number, because the mean of its divisors is an integer number (7174275).

Almost surely, 2^28572101 is an apocalyptic number.

It is an amenable number.

28572101 is a deficient number, since it is larger than the sum of its proper divisors (124999).

28572101 is a wasteful number, since it uses less digits than its factorization.

28572101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124998.

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

The square root of 28572101 is about 5345.2877378117. The cubic root of 28572101 is about 305.7131070146.

Adding to 28572101 its reverse (10127582), we get a palindrome (38699683).

The spelling of 28572101 in words is "twenty-eight million, five hundred seventy-two thousand, one hundred one".