172326656 has 72 divisors (see below), whose sum is σ = 367920000. Its totient is φ = 80317440.

The previous prime is 172326653. The next prime is 172326659. The reversal of 172326656 is 656623271.

It is an interprime number because it is at equal distance from previous prime (172326653) and next prime (172326659).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172326653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345095 + ... + 345593.

It is an arithmetic number, because the mean of its divisors is an integer number (5110000).

Almost surely, 2^172326656 is an apocalyptic number.

172326656 is a gapful number since it is divisible by the number (16) 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 172326656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183960000).

172326656 is an abundant number, since it is smaller than the sum of its proper divisors (195593344).

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

172326656 is an equidigital number, since it uses as much as digits as its factorization.

172326656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 591 counting only the distinct ones).

The product of its digits is 90720, while the sum is 38.

The square root of 172326656 is about 13127.3247845858. The cubic root of 172326656 is about 556.4816143399.

The spelling of 172326656 in words is "one hundred seventy-two million, three hundred twenty-six thousand, six hundred fifty-six".