30291220 has 12 divisors (see below), whose sum is σ = 63611604. Its totient is φ = 12116480.

The previous prime is 30291211. The next prime is 30291223. The reversal of 30291220 is 2219203.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5171076 + 25120144 = 2274^2 + 5012^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30291223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757261 + ... + 757300.

It is an arithmetic number, because the mean of its divisors is an integer number (5300967).

Almost surely, 2^30291220 is an apocalyptic number.

It is an amenable number.

30291220 is an abundant number, since it is smaller than the sum of its proper divisors (33320384).

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

30291220 is a wasteful number, since it uses less digits than its factorization.

30291220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514570 (or 1514568 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 30291220 is about 5503.7459970460. The cubic root of 30291220 is about 311.7254460646.

Adding to 30291220 its product of nonzero digits (216), we get a triangular number (30291436 = T₇₇₈₃).

The spelling of 30291220 in words is "thirty million, two hundred ninety-one thousand, two hundred twenty".