72643634620 has 24 divisors (see below), whose sum is σ = 152559954288. Its totient is φ = 29055868800.

The previous prime is 72643634617. The next prime is 72643634639. The reversal of 72643634620 is 2643634627.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319975 + ... + 497665.

It is an arithmetic number, because the mean of its divisors is an integer number (6356664762).

Almost surely, 2^72643634620 is an apocalyptic number.

It is an amenable number.

72643634620 is an abundant number, since it is smaller than the sum of its proper divisors (79916319668).

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

72643634620 is a wasteful number, since it uses less digits than its factorization.

72643634620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198141 (or 198139 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 43.

The spelling of 72643634620 in words is "seventy-two billion, six hundred forty-three million, six hundred thirty-four thousand, six hundred twenty".