30166721 has 8 divisors (see below), whose sum is σ = 34398504. Its totient is φ = 26208000.

The previous prime is 30166681. The next prime is 30166733. The reversal of 30166721 is 12766103.

It can be written as a sum of positive squares in 4 ways, for example, as 790321 + 29376400 = 889^2 + 5420^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30166721 - 2⁶ = 30166657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30166021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68030 + ... + 68471.

It is an arithmetic number, because the mean of its divisors is an integer number (4299813).

Almost surely, 2^30166721 is an apocalyptic number.

It is an amenable number.

30166721 is a deficient number, since it is larger than the sum of its proper divisors (4231783).

30166721 is a wasteful number, since it uses less digits than its factorization.

30166721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136531.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 30166721 is about 5492.4239639707. The cubic root of 30166721 is about 311.2977886118.

The spelling of 30166721 in words is "thirty million, one hundred sixty-six thousand, seven hundred twenty-one".