172804720 has 80 divisors (see below), whose sum is σ = 441936000. Its totient is φ = 62316800.

The previous prime is 172804717. The next prime is 172804721. The reversal of 172804720 is 27408271.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×172804720² = 59722942508556800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172804721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114531 + ... + 116029.

It is an arithmetic number, because the mean of its divisors is an integer number (5524200).

Almost surely, 2^172804720 is an apocalyptic number.

172804720 is a gapful number since it is divisible by the number (10) 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 172804720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220968000).

172804720 is an abundant number, since it is smaller than the sum of its proper divisors (269131280).

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

172804720 is a wasteful number, since it uses less digits than its factorization.

172804720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 172804720 is about 13145.5209101808. The cubic root of 172804720 is about 556.9957313529.

The spelling of 172804720 in words is "one hundred seventy-two million, eight hundred four thousand, seven hundred twenty".