172420452 has 36 divisors (see below), whose sum is σ = 441817740. Its totient is φ = 56685312.

The previous prime is 172420441. The next prime is 172420453. The reversal of 172420452 is 254024271.

172420452 is a `hidden beast` number, since 172 + 42 + 0 + 452 = 666.

172420452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 130507776 + 41912676 = 11424^2 + 6474^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (172420453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30177 + ... + 35432.

It is an arithmetic number, because the mean of its divisors is an integer number (12272715).

Almost surely, 2^172420452 is an apocalyptic number.

172420452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

172420452 is an abundant number, since it is smaller than the sum of its proper divisors (269397288).

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

172420452 is a wasteful number, since it uses less digits than its factorization.

172420452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65692 (or 65687 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 172420452 is about 13130.8968467504. The cubic root of 172420452 is about 556.5825588362.

The spelling of 172420452 in words is "one hundred seventy-two million, four hundred twenty thousand, four hundred fifty-two".