30071772 has 18 divisors (see below), whose sum is σ = 76014848. Its totient is φ = 10023912.

The previous prime is 30071771. The next prime is 30071849. The reversal of 30071772 is 27717003.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×30071772² = 1808622942439968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30071771) 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, 417628 + ... + 417699.

Almost surely, 2^30071772 is an apocalyptic number.

It is an amenable number.

30071772 is an abundant number, since it is smaller than the sum of its proper divisors (45943076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30071772 is a wasteful number, since it uses less digits than its factorization.

30071772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835337 (or 835332 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 27.

The square root of 30071772 is about 5483.7735182992. The cubic root of 30071772 is about 310.9708446871.

Adding to 30071772 its reverse (27717003), we get a palindrome (57788775).

The spelling of 30071772 in words is "thirty million, seventy-one thousand, seven hundred seventy-two".