28452172540 has 48 divisors (see below), whose sum is σ = 68015324160. Its totient is φ = 9896406080.

The previous prime is 28452172537. The next prime is 28452172543. The reversal of 28452172540 is 4527125482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28452172537) and next prime (28452172543).

It is a super-2 number, since 2×28452172540² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28452172493 and 28452172502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28452172543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2806420 + ... + 2816539.

It is an arithmetic number, because the mean of its divisors is an integer number (1416985920).

Almost surely, 2^28452172540 is an apocalyptic number.

28452172540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28452172540 is an abundant number, since it is smaller than the sum of its proper divisors (39563151620).

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

28452172540 is a wasteful number, since it uses less digits than its factorization.

28452172540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623002 (or 5623000 counting only the distinct ones).

The product of its (nonzero) digits is 179200, while the sum is 40.

The spelling of 28452172540 in words is "twenty-eight billion, four hundred fifty-two million, one hundred seventy-two thousand, five hundred forty".