72166450 has 24 divisors (see below), whose sum is σ = 138562560. Its totient is φ = 27934800.

The previous prime is 72166441. The next prime is 72166453. The reversal of 72166450 is 5466127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (72166453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21730 + ... + 24829.

It is an arithmetic number, because the mean of its divisors is an integer number (5773440).

Almost surely, 2^72166450 is an apocalyptic number.

72166450 is a deficient number, since it is larger than the sum of its proper divisors (66396110).

72166450 is a wasteful number, since it uses less digits than its factorization.

72166450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46602 (or 46597 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 72166450 is about 8495.0838724523. The cubic root of 72166450 is about 416.3371011743.

The spelling of 72166450 in words is "seventy-two million, one hundred sixty-six thousand, four hundred fifty".