2857521645 has 40 divisors (see below), whose sum is σ = 5588051040. Its totient is φ = 1385462880.

The previous prime is 2857521643. The next prime is 2857521647. The reversal of 2857521645 is 5461257582.

2857521645 is a `hidden beast` number, since 2 + 85 + 7 + 521 + 6 + 45 = 666.

2857521645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2857521643) and next prime (2857521647).

It is not a de Polignac number, because 2857521645 - 2¹ = 2857521643 is a prime.

It is a super-3 number, since 3×2857521645³ (a number of 29 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2857521645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857521643) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 316255 + ... + 325164.

It is an arithmetic number, because the mean of its divisors is an integer number (139701276).

Almost surely, 2^2857521645 is an apocalyptic number.

It is an amenable number.

2857521645 is a deficient number, since it is larger than the sum of its proper divisors (2730529395).

2857521645 is a wasteful number, since it uses less digits than its factorization.

2857521645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641447 (or 641438 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The square root of 2857521645 is about 53455.7915010151. The cubic root of 2857521645 is about 1419.0461167961.

The spelling of 2857521645 in words is "two billion, eight hundred fifty-seven million, five hundred twenty-one thousand, six hundred forty-five".