81073587020 has 48 divisors (see below), whose sum is σ = 172321188480. Its totient is φ = 32036438016.

The previous prime is 81073587011. The next prime is 81073587029. The reversal of 81073587020 is 2078537018.

It is an interprime number because it is at equal distance from previous prime (81073587011) and next prime (81073587029).

It is a super-3 number, since 3×81073587020³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81073587029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2032589 + ... + 2072091.

It is an arithmetic number, because the mean of its divisors is an integer number (3590024760).

Almost surely, 2^81073587020 is an apocalyptic number.

It is an amenable number.

81073587020 is an abundant number, since it is smaller than the sum of its proper divisors (91247601460).

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

81073587020 is a wasteful number, since it uses less digits than its factorization.

81073587020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40754 (or 40752 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The spelling of 81073587020 in words is "eighty-one billion, seventy-three million, five hundred eighty-seven thousand, twenty".