172100070 has 48 divisors (see below), whose sum is σ = 450712080. Its totient is φ = 45559872.

The previous prime is 172100069. The next prime is 172100077. The reversal of 172100070 is 70001271.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172100077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5632 + ... + 19388.

It is an arithmetic number, because the mean of its divisors is an integer number (9389835).

Almost surely, 2^172100070 is an apocalyptic number.

172100070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172100070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225356040).

172100070 is an abundant number, since it is smaller than the sum of its proper divisors (278612010).

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

172100070 is a wasteful number, since it uses less digits than its factorization.

172100070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13909 (or 13906 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 172100070 is about 13118.6916268354. The cubic root of 172100070 is about 556.2376082751.

The spelling of 172100070 in words is "one hundred seventy-two million, one hundred thousand, seventy".