172045458 has 112 divisors (see below), whose sum is σ = 432434520. Its totient is φ = 50948352.

The previous prime is 172045421. The next prime is 172045459. The reversal of 172045458 is 854540271.

It can be written as a sum of positive squares in 4 ways, for example, as 61732449 + 110313009 = 7857^2 + 10503^2 .

It is not an unprimeable number, because it can be changed into a prime (172045459) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 549510 + ... + 549822.

Almost surely, 2^172045458 is an apocalyptic number.

172045458 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 172045458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216217260).

172045458 is an abundant number, since it is smaller than the sum of its proper divisors (260389062).

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

172045458 is a wasteful number, since it uses less digits than its factorization.

172045458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 172045458 is about 13116.6100041131. The cubic root of 172045458 is about 556.1787656455.

The spelling of 172045458 in words is "one hundred seventy-two million, forty-five thousand, four hundred fifty-eight".