30724638 has 16 divisors (see below), whose sum is σ = 70227840. Its totient is φ = 8778456.

The previous prime is 30724637. The next prime is 30724649. The reversal of 30724638 is 83642703.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30724599 and 30724608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30724637) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 365728 + ... + 365811.

It is an arithmetic number, because the mean of its divisors is an integer number (4389240).

Almost surely, 2^30724638 is an apocalyptic number.

30724638 is an abundant number, since it is smaller than the sum of its proper divisors (39503202).

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

30724638 is a wasteful number, since it uses less digits than its factorization.

30724638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731551.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 30724638 is about 5542.9809669527. The cubic root of 30724638 is about 313.2051719206.

The spelling of 30724638 in words is "thirty million, seven hundred twenty-four thousand, six hundred thirty-eight".