172420620 has 24 divisors (see below), whose sum is σ = 482777904. Its totient is φ = 45978816.

The previous prime is 172420609. The next prime is 172420643. The reversal of 172420620 is 26024271.

172420620 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1436779 + ... + 1436898.

It is an arithmetic number, because the mean of its divisors is an integer number (20115746).

Almost surely, 2^172420620 is an apocalyptic number.

172420620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172420620 is an abundant number, since it is smaller than the sum of its proper divisors (310357284).

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

172420620 is a wasteful number, since it uses less digits than its factorization.

172420620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873689 (or 2873687 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 172420620 is about 13130.9032438747. The cubic root of 172420620 is about 556.5827396071.

Adding to 172420620 its reverse (26024271), we get a palindrome (198444891).

The spelling of 172420620 in words is "one hundred seventy-two million, four hundred twenty thousand, six hundred twenty".