30993651438 has 32 divisors (see below), whose sum is σ = 63549480960. Its totient is φ = 10071253440.

The previous prime is 30993651349. The next prime is 30993651457. The reversal of 30993651438 is 83415639903.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265381 + ... + 363887.

It is an arithmetic number, because the mean of its divisors is an integer number (1985921280).

Almost surely, 2^30993651438 is an apocalyptic number.

30993651438 is an abundant number, since it is smaller than the sum of its proper divisors (32555829522).

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

30993651438 is a wasteful number, since it uses less digits than its factorization.

30993651438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99832.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 30993651438 in words is "thirty billion, nine hundred ninety-three million, six hundred fifty-one thousand, four hundred thirty-eight".