71906642 has 8 divisors (see below), whose sum is σ = 108647676. Its totient is φ = 35690752.

The previous prime is 71906641. The next prime is 71906683. The reversal of 71906642 is 24660917.

It can be written as a sum of positive squares in 2 ways, for example, as 60824401 + 11082241 = 7799^2 + 3329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (71906641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130943 + ... + 131490.

Almost surely, 2^71906642 is an apocalyptic number.

71906642 is a deficient number, since it is larger than the sum of its proper divisors (36741034).

71906642 is a wasteful number, since it uses less digits than its factorization.

71906642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262572.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 71906642 is about 8479.7784169163. The cubic root of 71906642 is about 415.8368790006.

The spelling of 71906642 in words is "seventy-one million, nine hundred six thousand, six hundred forty-two".