3128561645 has 16 divisors (see below), whose sum is σ = 4172850432. Its totient is φ = 2232384960.

The previous prime is 3128561573. The next prime is 3128561659. The reversal of 3128561645 is 5461658213.

It is not a de Polignac number, because 3128561645 - 2⁸ = 3128561389 is a prime.

It is a super-3 number, since 3×3128561645³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

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, 533717 + ... + 539546.

It is an arithmetic number, because the mean of its divisors is an integer number (260803152).

Almost surely, 2^3128561645 is an apocalyptic number.

It is an amenable number.

3128561645 is a deficient number, since it is larger than the sum of its proper divisors (1044288787).

3128561645 is a wasteful number, since it uses less digits than its factorization.

3128561645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073332.

The product of its digits is 172800, while the sum is 41.

The square root of 3128561645 is about 55933.5466871179. The cubic root of 3128561645 is about 1462.5640882622.

The spelling of 3128561645 in words is "three billion, one hundred twenty-eight million, five hundred sixty-one thousand, six hundred forty-five".