172642018 has 32 divisors (see below), whose sum is σ = 278784000. Its totient is φ = 79943760.

The previous prime is 172642013. The next prime is 172642061. The reversal of 172642018 is 810246271.

It is a super-2 number, since 2×172642018² = 59610532758224648, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172642013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393043 + ... + 393481.

It is an arithmetic number, because the mean of its divisors is an integer number (8712000).

Almost surely, 2^172642018 is an apocalyptic number.

172642018 is a deficient number, since it is larger than the sum of its proper divisors (106141982).

172642018 is a wasteful number, since it uses less digits than its factorization.

172642018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 172642018 is about 13139.3309570921. The cubic root of 172642018 is about 556.8208658045.

Adding to 172642018 its reverse (810246271), we get a palindrome (982888289).

The spelling of 172642018 in words is "one hundred seventy-two million, six hundred forty-two thousand, eighteen".