172287388 has 72 divisors (see below), whose sum is σ = 389587968. Its totient is φ = 65153088.

The previous prime is 172287377. The next prime is 172287391. The reversal of 172287388 is 883782271.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108045 + ... + 109627.

It is an arithmetic number, because the mean of its divisors is an integer number (5410944).

Almost surely, 2^172287388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172287388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194793984).

172287388 is an abundant number, since it is smaller than the sum of its proper divisors (217300580).

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

172287388 is a wasteful number, since it uses less digits than its factorization.

172287388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1643 (or 1628 counting only the distinct ones).

The product of its digits is 301056, while the sum is 46.

The square root of 172287388 is about 13125.8290404835. The cubic root of 172287388 is about 556.4393427213.

The spelling of 172287388 in words is "one hundred seventy-two million, two hundred eighty-seven thousand, three hundred eighty-eight".