30455640 has 96 divisors (see below), whose sum is σ = 102211200. Its totient is φ = 7856640.

The previous prime is 30455639. The next prime is 30455669. The reversal of 30455640 is 4655403.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9796 + ... + 12524.

It is an arithmetic number, because the mean of its divisors is an integer number (1064700).

Almost surely, 2^30455640 is an apocalyptic number.

30455640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30455640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51105600).

30455640 is an abundant number, since it is smaller than the sum of its proper divisors (71755560).

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

30455640 is a wasteful number, since it uses less digits than its factorization.

30455640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 30455640 is about 5518.6628815321. The cubic root of 30455640 is about 312.2884413430.

The spelling of 30455640 in words is "thirty million, four hundred fifty-five thousand, six hundred forty".