73328640 has 384 divisors, whose sum is σ = 301916160. Its totient is φ = 14745600.

The previous prime is 73328639. The next prime is 73328663. The reversal of 73328640 is 4682337.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2365425 + ... + 2365455.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^73328640 is an apocalyptic number.

73328640 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 73328640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150958080).

73328640 is an abundant number, since it is smaller than the sum of its proper divisors (228587520).

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

73328640 is a wasteful number, since it uses less digits than its factorization.

73328640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 73328640 is about 8563.2143497638. The cubic root of 73328640 is about 418.5601488838.

The spelling of 73328640 in words is "seventy-three million, three hundred twenty-eight thousand, six hundred forty".