172945620 has 36 divisors (see below), whose sum is σ = 524602260. Its totient is φ = 46118784.

The previous prime is 172945547. The next prime is 172945637. The reversal of 172945620 is 26549271.

172945620 is a `hidden beast` number, since 1 + 7 + 2 + 94 + 562 + 0 = 666.

172945620 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 111260304 + 61685316 = 10548^2 + 7854^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 480225 + ... + 480584.

It is an arithmetic number, because the mean of its divisors is an integer number (14572285).

Almost surely, 2^172945620 is an apocalyptic number.

172945620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172945620 is an abundant number, since it is smaller than the sum of its proper divisors (351656640).

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

172945620 is a wasteful number, since it uses less digits than its factorization.

172945620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960824 (or 960819 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 172945620 is about 13150.8790580706. The cubic root of 172945620 is about 557.1470763276.

The spelling of 172945620 in words is "one hundred seventy-two million, nine hundred forty-five thousand, six hundred twenty".