81301873872 has 40 divisors (see below), whose sum is σ = 210777312960. Its totient is φ = 27004176640.

The previous prime is 81301873871. The next prime is 81301873931. The reversal of 81301873872 is 27837810318.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81301873871) 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, 3000372 + ... + 3027347.

It is an arithmetic number, because the mean of its divisors is an integer number (5269432824).

Almost surely, 2^81301873872 is an apocalyptic number.

It is an amenable number.

81301873872 is an abundant number, since it is smaller than the sum of its proper divisors (129475439088).

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

81301873872 is a wasteful number, since it uses less digits than its factorization.

81301873872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6028011 (or 6028005 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 48.

The spelling of 81301873872 in words is "eighty-one billion, three hundred one million, eight hundred seventy-three thousand, eight hundred seventy-two".