71072166 has 32 divisors (see below), whose sum is σ = 155536128. Its totient is φ = 21471840.

The previous prime is 71072149. The next prime is 71072171. The reversal of 71072166 is 66127017.

It is a happy number.

It is a Curzon number.

It is a congruent number.

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, 23175 + ... + 26061.

It is an arithmetic number, because the mean of its divisors is an integer number (4860504).

Almost surely, 2^71072166 is an apocalyptic number.

71072166 is an abundant number, since it is smaller than the sum of its proper divisors (84463962).

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

71072166 is a wasteful number, since it uses less digits than its factorization.

71072166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 71072166 is about 8430.4309498388. The cubic root of 71072166 is about 414.2220214523. Note that the first 3 decimals are identical.

The spelling of 71072166 in words is "seventy-one million, seventy-two thousand, one hundred sixty-six".