81589650972 has 24 divisors (see below), whose sum is σ = 192122422800. Its totient is φ = 26947040256.

The previous prime is 81589650959. The next prime is 81589650973. The reversal of 81589650972 is 27905698518.

It is a super-2 number, since 2×81589650972² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81589650973) 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, 31187397 + ... + 31190012.

It is an arithmetic number, because the mean of its divisors is an integer number (8005100950).

Almost surely, 2^81589650972 is an apocalyptic number.

It is an amenable number.

81589650972 is an abundant number, since it is smaller than the sum of its proper divisors (110532771828).

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

81589650972 is a wasteful number, since it uses less digits than its factorization.

81589650972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62377525 (or 62377523 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 81589650972 in words is "eighty-one billion, five hundred eighty-nine million, six hundred fifty thousand, nine hundred seventy-two".