172845820 has 24 divisors (see below), whose sum is σ = 414830304. Its totient is φ = 59261376.

The previous prime is 172845721. The next prime is 172845847. The reversal of 172845820 is 28548271.

It is a self number, because there is not a number n which added to its sum of digits gives 172845820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 617167 + ... + 617446.

It is an arithmetic number, because the mean of its divisors is an integer number (17284596).

Almost surely, 2^172845820 is an apocalyptic number.

172845820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172845820 is an abundant number, since it is smaller than the sum of its proper divisors (241984484).

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

172845820 is a wasteful number, since it uses less digits than its factorization.

172845820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234629 (or 1234627 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 172845820 is about 13147.0840873556. The cubic root of 172845820 is about 557.0398866088.

It can be divided in two parts, 17284 and 5820, that added together give a square (23104 = 152²).

The spelling of 172845820 in words is "one hundred seventy-two million, eight hundred forty-five thousand, eight hundred twenty".