172585478028 has 48 divisors (see below), whose sum is σ = 442324350720. Its totient is φ = 52131081024.

The previous prime is 172585478027. The next prime is 172585478029. The reversal of 172585478028 is 820874585271.

It is a happy number.

172585478028 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 (172585478027) and next prime (172585478029).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (172585478027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16450275 + ... + 16460762.

It is an arithmetic number, because the mean of its divisors is an integer number (9215090640).

Almost surely, 2^172585478028 is an apocalyptic number.

It is an amenable number.

172585478028 is an abundant number, since it is smaller than the sum of its proper divisors (269738872692).

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

172585478028 is a wasteful number, since it uses less digits than its factorization.

172585478028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32911086 (or 32911084 counting only the distinct ones).

The product of its (nonzero) digits is 10035200, while the sum is 57.

The spelling of 172585478028 in words is "one hundred seventy-two billion, five hundred eighty-five million, four hundred seventy-eight thousand, twenty-eight".