81400500672 has 56 divisors (see below), whose sum is σ = 215477604096. Its totient is φ = 27120215808.

The previous prime is 81400500653. The next prime is 81400500673. The reversal of 81400500672 is 27600500418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81400500673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293343 + ... + 498849.

Almost surely, 2^81400500672 is an apocalyptic number.

It is an amenable number.

81400500672 is an abundant number, since it is smaller than the sum of its proper divisors (134077103424).

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

81400500672 is a wasteful number, since it uses less digits than its factorization.

81400500672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207585 (or 207575 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The spelling of 81400500672 in words is "eighty-one billion, four hundred million, five hundred thousand, six hundred seventy-two".