81001308708 has 72 divisors (see below), whose sum is σ = 206562772416. Its totient is φ = 26762616000.

The previous prime is 81001308691. The next prime is 81001308761. The reversal of 81001308708 is 80780310018.

It is a super-2 number, since 2×81001308708² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (36) 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 (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2489835 + ... + 2522157.

Almost surely, 2^81001308708 is an apocalyptic number.

It is an amenable number.

81001308708 is an abundant number, since it is smaller than the sum of its proper divisors (125561463708).

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

81001308708 is a wasteful number, since it uses less digits than its factorization.

81001308708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32945 (or 32940 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The spelling of 81001308708 in words is "eighty-one billion, one million, three hundred eight thousand, seven hundred eight".