81073587038 has 4 divisors (see below), whose sum is σ = 121610380560. Its totient is φ = 40536793518.

The previous prime is 81073587037. The next prime is 81073587053. The reversal of 81073587038 is 83078537018.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×81073587038² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073587037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20268396758 + ... + 20268396761.

It is an arithmetic number, because the mean of its divisors is an integer number (30402595140).

Almost surely, 2^81073587038 is an apocalyptic number.

81073587038 is a deficient number, since it is larger than the sum of its proper divisors (40536793522).

81073587038 is a wasteful number, since it uses less digits than its factorization.

81073587038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40536793521.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 81073587038 in words is "eighty-one billion, seventy-three million, five hundred eighty-seven thousand, thirty-eight".