172045380 has 216 divisors, whose sum is σ = 562246272. Its totient is φ = 39267072.

The previous prime is 172045369. The next prime is 172045397. The reversal of 172045380 is 83540271.

It is a super-2 number, since 2×172045380² = 59199225558688800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3660517 + ... + 3660563.

It is an arithmetic number, because the mean of its divisors is an integer number (2602992).

Almost surely, 2^172045380 is an apocalyptic number.

172045380 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 172045380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281123136).

172045380 is an abundant number, since it is smaller than the sum of its proper divisors (390200892).

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

172045380 is a wasteful number, since it uses less digits than its factorization.

172045380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 172045380 is about 13116.6070307835. The cubic root of 172045380 is about 556.1786815942.

The spelling of 172045380 in words is "one hundred seventy-two million, forty-five thousand, three hundred eighty".