30722081 has 8 divisors (see below), whose sum is σ = 33855360. Its totient is φ = 27698832.

The previous prime is 30722057. The next prime is 30722093. The reversal of 30722081 is 18022703.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30722081 is a prime.

It is a super-2 number, since 2×30722081² = 1887692521941122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30722051) 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, 26921 + ... + 28038.

It is an arithmetic number, because the mean of its divisors is an integer number (4231920).

Almost surely, 2^30722081 is an apocalyptic number.

It is an amenable number.

30722081 is a deficient number, since it is larger than the sum of its proper divisors (3133279).

30722081 is a wasteful number, since it uses less digits than its factorization.

30722081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55015.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 30722081 is about 5542.7503100897. The cubic root of 30722081 is about 313.1964830432.

Adding to 30722081 its reverse (18022703), we get a palindrome (48744784).

The spelling of 30722081 in words is "thirty million, seven hundred twenty-two thousand, eighty-one".