30621544640 has 28 divisors (see below), whose sum is σ = 72917553936. Its totient is φ = 12248617728.

The previous prime is 30621544637. The next prime is 30621544697. The reversal of 30621544640 is 4644512603.

It is a super-2 number, since 2×30621544640² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 30621544640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47845844 + ... + 47846483.

Almost surely, 2^30621544640 is an apocalyptic number.

It is an amenable number.

30621544640 is an abundant number, since it is smaller than the sum of its proper divisors (42296009296).

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

30621544640 is an equidigital number, since it uses as much as digits as its factorization.

30621544640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95692344 (or 95692334 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 30621544640 in words is "thirty billion, six hundred twenty-one million, five hundred forty-four thousand, six hundred forty".