81328546 has 32 divisors (see below), whose sum is σ = 134346240. Its totient is φ = 36917712.

The previous prime is 81328537. The next prime is 81328567. The reversal of 81328546 is 64582318.

It is a happy number.

It is a super-2 number, since 2×81328546² = 13228664788948232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364591 + ... + 364813.

It is an arithmetic number, because the mean of its divisors is an integer number (4198320).

Almost surely, 2^81328546 is an apocalyptic number.

81328546 is a deficient number, since it is larger than the sum of its proper divisors (53017694).

81328546 is a wasteful number, since it uses less digits than its factorization.

81328546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347 (or 321 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 81328546 is about 9018.2340843427. The cubic root of 81328546 is about 433.2590761647.

The spelling of 81328546 in words is "eighty-one million, three hundred twenty-eight thousand, five hundred forty-six".