730172520 has 576 divisors, whose sum is σ = 3111488640. Its totient is φ = 146764800.

The previous prime is 730172519. The next prime is 730172533. The reversal of 730172520 is 25271037.

730172520 is a `hidden beast` number, since 73 + 0 + 1 + 72 + 520 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 10284085 + ... + 10284155.

It is an arithmetic number, because the mean of its divisors is an integer number (5401890).

Almost surely, 2^730172520 is an apocalyptic number.

730172520 is a gapful number since it is divisible by the number (70) 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 730172520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1555744320).

730172520 is an abundant number, since it is smaller than the sum of its proper divisors (2381316120).

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

730172520 is a wasteful number, since it uses less digits than its factorization.

730172520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 27.

The square root of 730172520 is about 27021.7046094431. The cubic root of 730172520 is about 900.4822600560.

The spelling of 730172520 in words is "seven hundred thirty million, one hundred seventy-two thousand, five hundred twenty".