28145523171904 has 42 divisors (see below), whose sum is σ = 59329898554850. Its totient is φ = 13244952072192.

The previous prime is 28145523171863. The next prime is 28145523171959. The reversal of 28145523171904 is 40917132554182.

It can be written as a sum of positive squares in 3 ways, for example, as 7949918593600 + 20195604578304 = 2819560^2 + 4493952^2 .

It is a super-2 number, since 2×28145523171904² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 760835829 + ... + 760872820.

Almost surely, 2^{28145523171904} is an apocalyptic number.

It is an amenable number.

28145523171904 is an abundant number, since it is smaller than the sum of its proper divisors (31184375382946).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28145523171904 is a wasteful number, since it uses less digits than its factorization.

28145523171904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521708695 (or 1521708668 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 52.

The spelling of 28145523171904 in words is "twenty-eight trillion, one hundred forty-five billion, five hundred twenty-three million, one hundred seventy-one thousand, nine hundred four".