30644138 has 32 divisors (see below), whose sum is σ = 54286848. Its totient is φ = 12700800.

The previous prime is 30644137. The next prime is 30644147. The reversal of 30644138 is 83144603.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30644138.

It is not an unprimeable number, because it can be changed into a prime (30644137) 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, 112943 + ... + 113213.

It is an arithmetic number, because the mean of its divisors is an integer number (1696464).

Almost surely, 2^30644138 is an apocalyptic number.

30644138 is a deficient number, since it is larger than the sum of its proper divisors (23642710).

30644138 is a wasteful number, since it uses less digits than its factorization.

30644138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 30644138 is about 5535.7147686636. The cubic root of 30644138 is about 312.9313952400.

It can be divided in two parts, 306 and 44138, that added together give a palindrome (44444).

The spelling of 30644138 in words is "thirty million, six hundred forty-four thousand, one hundred thirty-eight".