173640720 has 320 divisors, whose sum is σ = 642173184. Its totient is φ = 38338560.

The previous prime is 173640697. The next prime is 173640757. The reversal of 173640720 is 27046371.

173640720 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2378604 + ... + 2378676.

Almost surely, 2^173640720 is an apocalyptic number.

173640720 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 173640720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321086592).

173640720 is an abundant number, since it is smaller than the sum of its proper divisors (468532464).

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

173640720 is a wasteful number, since it uses less digits than its factorization.

173640720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 173640720 is about 13177.2804478011. The cubic root of 173640720 is about 557.8925037977.

The spelling of 173640720 in words is "one hundred seventy-three million, six hundred forty thousand, seven hundred twenty".