71801945 has 16 divisors (see below), whose sum is σ = 87827328. Its totient is φ = 56340480.

The previous prime is 71801927. The next prime is 71801953. The reversal of 71801945 is 54910817.

It is not a de Polignac number, because 71801945 - 2¹⁰ = 71800921 is a prime.

It is a Duffinian 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, 90842 + ... + 91628.

It is an arithmetic number, because the mean of its divisors is an integer number (5489208).

Almost surely, 2^71801945 is an apocalyptic number.

It is an amenable number.

71801945 is a deficient number, since it is larger than the sum of its proper divisors (16025383).

71801945 is a wasteful number, since it uses less digits than its factorization.

71801945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 71801945 is about 8473.6028346861. The cubic root of 71801945 is about 415.6349596799.

The spelling of 71801945 in words is "seventy-one million, eight hundred one thousand, nine hundred forty-five".