30721634136 has 96 divisors (see below), whose sum is σ = 86465808000. Its totient is φ = 9843586560.

The previous prime is 30721634093. The next prime is 30721634143. The reversal of 30721634136 is 63143612703.

30721634136 is a `hidden beast` number, since 3 + 0 + 7 + 2 + 1 + 634 + 13 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 30721634136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286380 + ... + 378756.

It is an arithmetic number, because the mean of its divisors is an integer number (900685500).

Almost surely, 2^30721634136 is an apocalyptic number.

30721634136 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30721634136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43232904000).

30721634136 is an abundant number, since it is smaller than the sum of its proper divisors (55744173864).

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

30721634136 is a wasteful number, since it uses less digits than its factorization.

30721634136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92569 (or 92562 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The spelling of 30721634136 in words is "thirty billion, seven hundred twenty-one million, six hundred thirty-four thousand, one hundred thirty-six".