30638740 has 24 divisors (see below), whose sum is σ = 70191072. Its totient is φ = 11141280.

The previous prime is 30638731. The next prime is 30638749. The reversal of 30638740 is 4783603.

It is an interprime number because it is at equal distance from previous prime (30638731) and next prime (30638749).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30638749) 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, 69414 + ... + 69853.

It is an arithmetic number, because the mean of its divisors is an integer number (2924628).

Almost surely, 2^30638740 is an apocalyptic number.

It is an amenable number.

30638740 is an abundant number, since it is smaller than the sum of its proper divisors (39552332).

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

30638740 is a wasteful number, since it uses less digits than its factorization.

30638740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139287 (or 139285 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 30638740 is about 5535.2271859428. The cubic root of 30638740 is about 312.9130197532.

The spelling of 30638740 in words is "thirty million, six hundred thirty-eight thousand, seven hundred forty".