30621144 has 64 divisors (see below), whose sum is σ = 78825600. Its totient is φ = 9909504.

The previous prime is 30621113. The next prime is 30621161. The reversal of 30621144 is 44112603.

It is a super-4 number, since 4×30621144⁴ (a number of 31 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30621144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220227 + ... + 220365.

It is an arithmetic number, because the mean of its divisors is an integer number (1231650).

Almost surely, 2^30621144 is an apocalyptic number.

It is an amenable number.

30621144 is an abundant number, since it is smaller than the sum of its proper divisors (48204456).

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

30621144 is a wasteful number, since it uses less digits than its factorization.

30621144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 348 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 30621144 is about 5533.6375016801. The cubic root of 30621144 is about 312.8531057154.

Adding to 30621144 its reverse (44112603), we get a palindrome (74733747).

The spelling of 30621144 in words is "thirty million, six hundred twenty-one thousand, one hundred forty-four".