172345890 has 16 divisors (see below), whose sum is σ = 413630208. Its totient is φ = 45958896.

The previous prime is 172345871. The next prime is 172345907. The reversal of 172345890 is 98543271.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2872402 + ... + 2872461.

It is an arithmetic number, because the mean of its divisors is an integer number (25851888).

Almost surely, 2^172345890 is an apocalyptic number.

172345890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172345890 is an abundant number, since it is smaller than the sum of its proper divisors (241284318).

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

172345890 is a wasteful number, since it uses less digits than its factorization.

172345890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5744873.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 172345890 is about 13128.0573581928. The cubic root of 172345890 is about 556.5023172101.

The spelling of 172345890 in words is "one hundred seventy-two million, three hundred forty-five thousand, eight hundred ninety".