81680410 has 32 divisors (see below), whose sum is σ = 177914880. Its totient is φ = 26356992.

The previous prime is 81680387. The next prime is 81680447. The reversal of 81680410 is 1408618.

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, 33130 + ... + 35509.

It is an arithmetic number, because the mean of its divisors is an integer number (5559840).

Almost surely, 2^81680410 is an apocalyptic number.

81680410 is an abundant number, since it is smaller than the sum of its proper divisors (96234470).

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

81680410 is a wasteful number, since it uses less digits than its factorization.

81680410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68670.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81680410 is about 9037.7215048927. The cubic root of 81680410 is about 433.8830020088.

The spelling of 81680410 in words is "eighty-one million, six hundred eighty thousand, four hundred ten".