81280861420 has 24 divisors (see below), whose sum is σ = 186207064848. Its totient is φ = 29556676800.

The previous prime is 81280861391. The next prime is 81280861423. The reversal of 81280861420 is 2416808218.

It is not an unprimeable number, because it can be changed into a prime (81280861423) 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, 184729011 + ... + 184729450.

It is an arithmetic number, because the mean of its divisors is an integer number (7758627702).

Almost surely, 2^81280861420 is an apocalyptic number.

It is an amenable number.

81280861420 is an abundant number, since it is smaller than the sum of its proper divisors (104926203428).

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

81280861420 is a wasteful number, since it uses less digits than its factorization.

81280861420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369458481 (or 369458479 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The spelling of 81280861420 in words is "eighty-one billion, two hundred eighty million, eight hundred sixty-one thousand, four hundred twenty".