72165550 has 12 divisors (see below), whose sum is σ = 134228016. Its totient is φ = 28866200.

The previous prime is 72165547. The next prime is 72165557. The reversal of 72165550 is 5556127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72165557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 721606 + ... + 721705.

It is an arithmetic number, because the mean of its divisors is an integer number (11185668).

Almost surely, 2^72165550 is an apocalyptic number.

72165550 is a deficient number, since it is larger than the sum of its proper divisors (62062466).

72165550 is a wasteful number, since it uses less digits than its factorization.

72165550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443323 (or 1443318 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 72165550 is about 8495.0309004735. The cubic root of 72165550 is about 416.3353704303.

The spelling of 72165550 in words is "seventy-two million, one hundred sixty-five thousand, five hundred fifty".