172638290 has 64 divisors (see below), whose sum is σ = 351630720. Its totient is φ = 60480000.

The previous prime is 172638289. The next prime is 172638293. The reversal of 172638290 is 92836271.

172638290 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (172638293) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 455321 + ... + 455699.

It is an arithmetic number, because the mean of its divisors is an integer number (5494230).

Almost surely, 2^172638290 is an apocalyptic number.

172638290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172638290 is an abundant number, since it is smaller than the sum of its proper divisors (178992430).

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

172638290 is a wasteful number, since it uses less digits than its factorization.

172638290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 172638290 is about 13139.1890921776. The cubic root of 172638290 is about 556.8168578132.

The spelling of 172638290 in words is "one hundred seventy-two million, six hundred thirty-eight thousand, two hundred ninety".