81466320 has 80 divisors (see below), whose sum is σ = 271982592. Its totient is φ = 20052480.

The previous prime is 81466313. The next prime is 81466331. The reversal of 81466320 is 2366418.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×81466320² = 13273522588684800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9936 + ... + 16175.

Almost surely, 2^81466320 is an apocalyptic number.

81466320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81466320 is an abundant number, since it is smaller than the sum of its proper divisors (190516272).

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

81466320 is a wasteful number, since it uses less digits than its factorization.

81466320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26140 (or 26134 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 81466320 is about 9025.8694872018. The cubic root of 81466320 is about 433.5035912161.

It can be divided in two parts, 8 and 1466320, that added together give a triangular number (1466328 = T₁₇₁₂).

The spelling of 81466320 in words is "eighty-one million, four hundred sixty-six thousand, three hundred twenty".