30219640 has 64 divisors (see below), whose sum is σ = 74792160. Its totient is φ = 10897920.

The previous prime is 30219619. The next prime is 30219643. The reversal of 30219640 is 4691203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30219643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75922 + ... + 76318.

Almost surely, 2^30219640 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 30219640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37396080).

30219640 is an abundant number, since it is smaller than the sum of its proper divisors (44572520).

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

30219640 is a wasteful number, since it uses less digits than its factorization.

30219640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 30219640 is about 5497.2393071432. The cubic root of 30219640 is about 311.4797103207.

The spelling of 30219640 in words is "thirty million, two hundred nineteen thousand, six hundred forty".