172420572 has 24 divisors (see below), whose sum is σ = 402763536. Its totient is φ = 57409408.

The previous prime is 172420571. The next prime is 172420609. The reversal of 172420572 is 275024271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172420571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3898 + ... + 18974.

It is an arithmetic number, because the mean of its divisors is an integer number (16781814).

Almost surely, 2^172420572 is an apocalyptic number.

172420572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172420572 is an abundant number, since it is smaller than the sum of its proper divisors (230342964).

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

172420572 is a wasteful number, since it uses less digits than its factorization.

172420572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16037 (or 16035 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 172420572 is about 13130.9014161252. The cubic root of 172420572 is about 556.5826879583.

The spelling of 172420572 in words is "one hundred seventy-two million, four hundred twenty thousand, five hundred seventy-two".