81072733430 has 32 divisors (see below), whose sum is σ = 165427768800. Its totient is φ = 28359044352.

The previous prime is 81072733429. The next prime is 81072733453. The reversal of 81072733430 is 3433727018.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16409015 + ... + 16413954.

It is an arithmetic number, because the mean of its divisors is an integer number (5169617775).

Almost surely, 2^81072733430 is an apocalyptic number.

81072733430 is an abundant number, since it is smaller than the sum of its proper divisors (84355035370).

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

81072733430 is a wasteful number, since it uses less digits than its factorization.

81072733430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32823008.

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 81072733430 in words is "eighty-one billion, seventy-two million, seven hundred thirty-three thousand, four hundred thirty".