30221988 has 24 divisors (see below), whose sum is σ = 74666592. Its totient is φ = 9481344.

The previous prime is 30221969. The next prime is 30222011. The reversal of 30221988 is 88912203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73870 + ... + 74277.

It is an arithmetic number, because the mean of its divisors is an integer number (3111108).

Almost surely, 2^30221988 is an apocalyptic number.

It is an amenable number.

30221988 is an abundant number, since it is smaller than the sum of its proper divisors (44444604).

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

30221988 is a wasteful number, since it uses less digits than its factorization.

30221988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148171 (or 148169 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 30221988 is about 5497.4528647365. The cubic root of 30221988 is about 311.4877772094.

The spelling of 30221988 in words is "thirty million, two hundred twenty-one thousand, nine hundred eighty-eight".