30636531820 has 24 divisors (see below), whose sum is σ = 66412096128. Its totient is φ = 11859302400.

The previous prime is 30636531733. The next prime is 30636531833. The reversal of 30636531820 is 2813563603.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 30636531820.

It is an unprimeable number.

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, 24706261 + ... + 24707500.

It is an arithmetic number, because the mean of its divisors is an integer number (2767170672).

Almost surely, 2^30636531820 is an apocalyptic number.

It is an amenable number.

30636531820 is an abundant number, since it is smaller than the sum of its proper divisors (35775564308).

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

30636531820 is a wasteful number, since it uses less digits than its factorization.

30636531820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49413801 (or 49413799 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 30636531820 in words is "thirty billion, six hundred thirty-six million, five hundred thirty-one thousand, eight hundred twenty".