172008020840 has 32 divisors (see below), whose sum is σ = 387030863880. Its totient is φ = 68800929792.

The previous prime is 172008020839. The next prime is 172008020897. The reversal of 172008020840 is 48020800271.

It can be written as a sum of positive squares in 4 ways, for example, as 145068050884 + 26939969956 = 380878^2 + 164134^2 .

It is a junction number, because it is equal to n+sod(n) for n = 172008020797 and 172008020806.

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, 1688804 + ... + 1787756.

Almost surely, 2^172008020840 is an apocalyptic number.

172008020840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172008020840 is an abundant number, since it is smaller than the sum of its proper divisors (215022843040).

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

172008020840 is a wasteful number, since it uses less digits than its factorization.

172008020840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142421 (or 142417 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The spelling of 172008020840 in words is "one hundred seventy-two billion, eight million, twenty thousand, eight hundred forty".