172378572 has 72 divisors (see below), whose sum is σ = 436964976. Its totient is φ = 52706304.

The previous prime is 172378561. The next prime is 172378601. The reversal of 172378572 is 275873271.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 376968 + ... + 377424.

It is an arithmetic number, because the mean of its divisors is an integer number (6068958).

Almost surely, 2^172378572 is an apocalyptic number.

172378572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172378572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218482488).

172378572 is an abundant number, since it is smaller than the sum of its proper divisors (264586404).

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

172378572 is a wasteful number, since it uses less digits than its factorization.

172378572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 522 counting only the distinct ones).

The product of its digits is 164640, while the sum is 42.

The square root of 172378572 is about 13129.3020378084. The cubic root of 172378572 is about 556.5374915509.

The spelling of 172378572 in words is "one hundred seventy-two million, three hundred seventy-eight thousand, five hundred seventy-two".