30676721 has 4 divisors (see below), whose sum is σ = 32481252. Its totient is φ = 28872192.

The previous prime is 30676703. The next prime is 30676739. The reversal of 30676721 is 12767603.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12767603 = 43 ⋅296921.

It is an interprime number because it is at equal distance from previous prime (30676703) and next prime (30676739).

It can be written as a sum of positive squares in 2 ways, for example, as 20205025 + 10471696 = 4495^2 + 3236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30676721 is a prime.

It is a super-2 number, since 2×30676721² = 1882122422623682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30676741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902240 + ... + 902273.

It is an arithmetic number, because the mean of its divisors is an integer number (8120313).

Almost surely, 2^30676721 is an apocalyptic number.

It is an amenable number.

30676721 is a deficient number, since it is larger than the sum of its proper divisors (1804531).

30676721 is a wasteful number, since it uses less digits than its factorization.

30676721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804530.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 30676721 is about 5538.6569671717. The cubic root of 30676721 is about 313.0422661674.

The spelling of 30676721 in words is "thirty million, six hundred seventy-six thousand, seven hundred twenty-one".