81346880 has 28 divisors (see below), whose sum is σ = 193708020. Its totient is φ = 32538624.

The previous prime is 81346879. The next prime is 81346913. The reversal of 81346880 is 8864318.

It can be written as a sum of positive squares in 2 ways, for example, as 8620096 + 72726784 = 2936^2 + 8528^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126785 + ... + 127424.

Almost surely, 2^81346880 is an apocalyptic number.

81346880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81346880 is an abundant number, since it is smaller than the sum of its proper divisors (112361140).

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

81346880 is a wasteful number, since it uses less digits than its factorization.

81346880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254226 (or 254216 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 81346880 is about 9019.2505231865. The cubic root of 81346880 is about 433.2916304378.

The spelling of 81346880 in words is "eighty-one million, three hundred forty-six thousand, eight hundred eighty".