71945978 has 32 divisors (see below), whose sum is σ = 125217792. Its totient is φ = 30729600.

The previous prime is 71945927. The next prime is 71945999. The reversal of 71945978 is 87954917.

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, 16598 + ... + 20478.

It is an arithmetic number, because the mean of its divisors is an integer number (3913056).

Almost surely, 2^71945978 is an apocalyptic number.

71945978 is a deficient number, since it is larger than the sum of its proper divisors (53271814).

71945978 is a wasteful number, since it uses less digits than its factorization.

71945978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950.

The product of its digits is 635040, while the sum is 50.

The square root of 71945978 is about 8482.0975000291. The cubic root of 71945978 is about 415.9126920141.

The spelling of 71945978 in words is "seventy-one million, nine hundred forty-five thousand, nine hundred seventy-eight".