30321640 has 16 divisors (see below), whose sum is σ = 68223780. Its totient is φ = 12128640.

The previous prime is 30321637. The next prime is 30321667. The reversal of 30321640 is 4612303.

It can be written as a sum of positive squares in 2 ways, for example, as 30228004 + 93636 = 5498^2 + 306^2 .

It is a super-3 number, since 3×30321640³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378981 + ... + 379060.

Almost surely, 2^30321640 is an apocalyptic number.

It is an amenable number.

30321640 is an abundant number, since it is smaller than the sum of its proper divisors (37902140).

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

30321640 is a wasteful number, since it uses less digits than its factorization.

30321640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758052 (or 758048 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 30321640 is about 5506.5088758668. The cubic root of 30321640 is about 311.8297613910.

Adding to 30321640 its reverse (4612303), we get a palindrome (34933943).

The spelling of 30321640 in words is "thirty million, three hundred twenty-one thousand, six hundred forty".