30722560 has 80 divisors (see below), whose sum is σ = 80432352. Its totient is φ = 11161600.

The previous prime is 30722521. The next prime is 30722567. The reversal of 30722560 is 6522703.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (30722567) 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, 27615 + ... + 28705.

Almost surely, 2^30722560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30722560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40216176).

30722560 is an abundant number, since it is smaller than the sum of its proper divisors (49709792).

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

30722560 is a wasteful number, since it uses less digits than its factorization.

30722560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125 (or 1109 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 30722560 is about 5542.7935195170. The cubic root of 30722560 is about 313.1981107577.

The spelling of 30722560 in words is "thirty million, seven hundred twenty-two thousand, five hundred sixty".