71969642 has 4 divisors (see below), whose sum is σ = 107954466. Its totient is φ = 35984820.

The previous prime is 71969641. The next prime is 71969657. The reversal of 71969642 is 24696917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 67256401 + 4713241 = 8201^2 + 2171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71969593 and 71969602.

It is not an unprimeable number, because it can be changed into a prime (71969641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17992409 + ... + 17992412.

Almost surely, 2^71969642 is an apocalyptic number.

71969642 is a deficient number, since it is larger than the sum of its proper divisors (35984824).

71969642 is a wasteful number, since it uses less digits than its factorization.

71969642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35984823.

The product of its digits is 163296, while the sum is 44.

The square root of 71969642 is about 8483.4923233301. The cubic root of 71969642 is about 415.9582867753.

The spelling of 71969642 in words is "seventy-one million, nine hundred sixty-nine thousand, six hundred forty-two".