81428050272 has 24 divisors (see below), whose sum is σ = 213748632216. Its totient is φ = 27142683392.

The previous prime is 81428050259. The next prime is 81428050273. The reversal of 81428050272 is 27205082418.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 81428050272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81428050273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424104333 + ... + 424104524.

It is an arithmetic number, because the mean of its divisors is an integer number (8906193009).

Almost surely, 2^81428050272 is an apocalyptic number.

It is an amenable number.

81428050272 is an abundant number, since it is smaller than the sum of its proper divisors (132320581944).

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

81428050272 is a wasteful number, since it uses less digits than its factorization.

81428050272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848208870 (or 848208862 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 39.

The spelling of 81428050272 in words is "eighty-one billion, four hundred twenty-eight million, fifty thousand, two hundred seventy-two".