30290720 has 72 divisors (see below), whose sum is σ = 74320092. Its totient is φ = 11665920.

The previous prime is 30290717. The next prime is 30290783. The reversal of 30290720 is 2709203.

It can be written as a sum of positive squares in 2 ways, for example, as 28430224 + 1860496 = 5332^2 + 1364^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 153662 + ... + 153858.

Almost surely, 2^30290720 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 30290720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37160046).

30290720 is an abundant number, since it is smaller than the sum of its proper divisors (44029372).

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

30290720 is a wasteful number, since it uses less digits than its factorization.

30290720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 30290720 is about 5503.7005732507. The cubic root of 30290720 is about 311.7237308968.

Adding to 30290720 its reverse (2709203), we get a palindrome (32999923).

The spelling of 30290720 in words is "thirty million, two hundred ninety thousand, seven hundred twenty".