81203572032 has 112 divisors (see below), whose sum is σ = 240717945792. Its totient is φ = 23942062080.

The previous prime is 81203572031. The next prime is 81203572033. The reversal of 81203572032 is 23027530218.

It is an interprime number because it is at equal distance from previous prime (81203572031) and next prime (81203572033).

It is a super-2 number, since 2×81203572032² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81203571984 and 81203572002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81203572031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441433 + ... + 597720.

Almost surely, 2^81203572032 is an apocalyptic number.

It is an amenable number.

81203572032 is an abundant number, since it is smaller than the sum of its proper divisors (159514373760).

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

81203572032 is a wasteful number, since it uses less digits than its factorization.

81203572032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039216 (or 1039206 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The spelling of 81203572032 in words is "eighty-one billion, two hundred three million, five hundred seventy-two thousand, thirty-two".