72821521632 has 48 divisors (see below), whose sum is σ = 191225688192. Its totient is φ = 24265054080.

The previous prime is 72821521631. The next prime is 72821521649. The reversal of 72821521632 is 23612512827.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72821521631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132043 + ... + 403829.

It is an arithmetic number, because the mean of its divisors is an integer number (3983868504).

Almost surely, 2^72821521632 is an apocalyptic number.

It is an amenable number.

72821521632 is an abundant number, since it is smaller than the sum of its proper divisors (118404166560).

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

72821521632 is a wasteful number, since it uses less digits than its factorization.

72821521632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274591 (or 274583 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The spelling of 72821521632 in words is "seventy-two billion, eight hundred twenty-one million, five hundred twenty-one thousand, six hundred thirty-two".