172136640 has 168 divisors, whose sum is σ = 592366608. Its totient is φ = 42332160.

The previous prime is 172136581. The next prime is 172136641. The reversal of 172136640 is 46631271.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 172136598 and 172136607.

It is not an unprimeable number, because it can be changed into a prime (172136641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161710 + ... + 162770.

Almost surely, 2^172136640 is an apocalyptic number.

172136640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172136640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296183304).

172136640 is an abundant number, since it is smaller than the sum of its proper divisors (420229968).

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

172136640 is a wasteful number, since it uses less digits than its factorization.

172136640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107 (or 1084 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 172136640 is about 13120.0853655759. The cubic root of 172136640 is about 556.2770042859.

The spelling of 172136640 in words is "one hundred seventy-two million, one hundred thirty-six thousand, six hundred forty".