30638730 has 16 divisors (see below), whose sum is σ = 73533024. Its totient is φ = 8170320.

The previous prime is 30638723. The next prime is 30638731. The reversal of 30638730 is 3783603.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1021291 = 30638730 / (3 + 0 + 6 + 3 + 8 + 7 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (30638731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510616 + ... + 510675.

It is an arithmetic number, because the mean of its divisors is an integer number (4595814).

Almost surely, 2^30638730 is an apocalyptic number.

30638730 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

30638730 is an abundant number, since it is smaller than the sum of its proper divisors (42894294).

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

30638730 is a wasteful number, since it uses less digits than its factorization.

30638730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021301.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 30638730 is about 5535.2262826374. The cubic root of 30638730 is about 312.9129857099.

The spelling of 30638730 in words is "thirty million, six hundred thirty-eight thousand, seven hundred thirty".