28571645 has 16 divisors (see below), whose sum is σ = 36551088. Its totient is φ = 21365760.

The previous prime is 28571639. The next prime is 28571657. The reversal of 28571645 is 54617582.

It can be written as a sum of positive squares in 8 ways, for example, as 1811716 + 26759929 = 1346^2 + 5173^2 .

It is not a de Polignac number, because 28571645 - 2¹⁰ = 28570621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28571599 and 28571608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12275 + ... + 14415.

It is an arithmetic number, because the mean of its divisors is an integer number (2284443).

Almost surely, 2^28571645 is an apocalyptic number.

It is an amenable number.

28571645 is a deficient number, since it is larger than the sum of its proper divisors (7979443).

28571645 is a wasteful number, since it uses less digits than its factorization.

28571645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320.

The product of its digits is 67200, while the sum is 38.

The square root of 28571645 is about 5345.2450832492. The cubic root of 28571645 is about 305.7114806505.

The spelling of 28571645 in words is "twenty-eight million, five hundred seventy-one thousand, six hundred forty-five".