81066670 has 16 divisors (see below), whose sum is σ = 146243520. Its totient is φ = 32354784.

The previous prime is 81066637. The next prime is 81066691. The reversal of 81066670 is 7666018.

It is a zygodrome in base 14.

It is a congruent 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, 4125 + ... + 13384.

It is an arithmetic number, because the mean of its divisors is an integer number (9140220).

Almost surely, 2^81066670 is an apocalyptic number.

81066670 is a deficient number, since it is larger than the sum of its proper divisors (65176850).

81066670 is a wasteful number, since it uses less digits than its factorization.

81066670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17979.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 81066670 is about 9003.7031270472. The cubic root of 81066670 is about 432.7935481412.

The spelling of 81066670 in words is "eighty-one million, sixty-six thousand, six hundred seventy".