172420544 has 28 divisors (see below), whose sum is σ = 353949000. Its totient is φ = 83236608.

The previous prime is 172420541. The next prime is 172420553. The reversal of 172420544 is 445024271.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172420541) 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 3 ways as a sum of consecutive naturals, for example, 44594 + ... + 48305.

Almost surely, 2^172420544 is an apocalyptic number.

It is an amenable number.

172420544 is an abundant number, since it is smaller than the sum of its proper divisors (181528456).

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

172420544 is an equidigital number, since it uses as much as digits as its factorization.

172420544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92940 (or 92930 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 29.

The square root of 172420544 is about 13130.9003499379. The cubic root of 172420544 is about 556.5826578298.

The spelling of 172420544 in words is "one hundred seventy-two million, four hundred twenty thousand, five hundred forty-four".