71906945 has 16 divisors (see below), whose sum is σ = 96139008. Its totient is φ = 51181440.

The previous prime is 71906941. The next prime is 71906951. The reversal of 71906945 is 54960917.

It is not a de Polignac number, because 71906945 - 2² = 71906941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71906941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11324 + ... + 16493.

It is an arithmetic number, because the mean of its divisors is an integer number (6008688).

Almost surely, 2^71906945 is an apocalyptic number.

It is an amenable number.

71906945 is a deficient number, since it is larger than the sum of its proper divisors (24232063).

71906945 is a wasteful number, since it uses less digits than its factorization.

71906945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27880.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 71906945 is about 8479.7962829304. The cubic root of 71906945 is about 415.8374630839.

The spelling of 71906945 in words is "seventy-one million, nine hundred six thousand, nine hundred forty-five".