172028578572 has 30 divisors (see below), whose sum is σ = 449716686188. Its totient is φ = 57342859416.

The previous prime is 172028578571. The next prime is 172028578619. The reversal of 172028578572 is 275875820271.

It is a happy number.

172028578572 is a `hidden beast` number, since 17 + 2 + 0 + 2 + 8 + 57 + 8 + 572 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (172028578571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 265475878 + ... + 265476525.

Almost surely, 2^172028578572 is an apocalyptic number.

172028578572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172028578572 is an abundant number, since it is smaller than the sum of its proper divisors (277688107616).

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

172028578572 is a wasteful number, since it uses less digits than its factorization.

172028578572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530952419 (or 530952408 counting only the distinct ones).

The product of its (nonzero) digits is 4390400, while the sum is 54.

The spelling of 172028578572 in words is "one hundred seventy-two billion, twenty-eight million, five hundred seventy-eight thousand, five hundred seventy-two".