30223640 has 32 divisors (see below), whose sum is σ = 68344560. Its totient is φ = 12028800.

The previous prime is 30223579. The next prime is 30223643. The reversal of 30223640 is 4632203.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30223643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6650 + ... + 10230.

Almost surely, 2^30223640 is an apocalyptic number.

It is an amenable number.

30223640 is an abundant number, since it is smaller than the sum of its proper divisors (38120920).

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

30223640 is a wasteful number, since it uses less digits than its factorization.

30223640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3803 (or 3799 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 30223640 is about 5497.6031140853. The cubic root of 30223640 is about 311.4934526405.

Adding to 30223640 its reverse (4632203), we get a palindrome (34855843).

The spelling of 30223640 in words is "thirty million, two hundred twenty-three thousand, six hundred forty".