81026700320 has 48 divisors (see below), whose sum is σ = 191518266240. Its totient is φ = 32394987264.

The previous prime is 81026700247. The next prime is 81026700331. The reversal of 81026700320 is 2300762018.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211721 + ... + 454839.

It is an arithmetic number, because the mean of its divisors is an integer number (3989963880).

Almost surely, 2^81026700320 is an apocalyptic number.

81026700320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81026700320 is an abundant number, since it is smaller than the sum of its proper divisors (110491565920).

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

81026700320 is a wasteful number, since it uses less digits than its factorization.

81026700320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245217 (or 245209 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The spelling of 81026700320 in words is "eighty-one billion, twenty-six million, seven hundred thousand, three hundred twenty".