72173340 has 36 divisors (see below), whose sum is σ = 218926344. Its totient is φ = 19246176.

The previous prime is 72173329. The next prime is 72173357. The reversal of 72173340 is 4337127.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 200302 + ... + 200661.

Almost surely, 2^72173340 is an apocalyptic number.

It is an amenable number.

72173340 is an abundant number, since it is smaller than the sum of its proper divisors (146753004).

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

72173340 is a wasteful number, since it uses less digits than its factorization.

72173340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400978 (or 400973 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 72173340 is about 8495.4893914359. The cubic root of 72173340 is about 416.3503505043.

The spelling of 72173340 in words is "seventy-two million, one hundred seventy-three thousand, three hundred forty".