172909090 has 16 divisors (see below), whose sum is σ = 311542272. Its totient is φ = 69095664.

The previous prime is 172909081. The next prime is 172909129. The reversal of 172909090 is 90909271.

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, 2917 + ... + 18823.

It is an arithmetic number, because the mean of its divisors is an integer number (19471392).

Almost surely, 2^172909090 is an apocalyptic number.

172909090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172909090 is a deficient number, since it is larger than the sum of its proper divisors (138633182).

172909090 is a wasteful number, since it uses less digits than its factorization.

172909090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17001.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 172909090 is about 13149.4901041827. The cubic root of 172909090 is about 557.1078462393.

The spelling of 172909090 in words is "one hundred seventy-two million, nine hundred nine thousand, ninety".