71404642 has 4 divisors (see below), whose sum is σ = 107106966. Its totient is φ = 35702320.

The previous prime is 71404637. The next prime is 71404643. The reversal of 71404642 is 24640417.

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., 70913241 + 491401 = 8421^2 + 701^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71404642.

It is not an unprimeable number, because it can be changed into a prime (71404643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17851159 + ... + 17851162.

Almost surely, 2^71404642 is an apocalyptic number.

71404642 is a deficient number, since it is larger than the sum of its proper divisors (35702324).

71404642 is a wasteful number, since it uses less digits than its factorization.

71404642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35702323.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 71404642 is about 8450.1267446116. The cubic root of 71404642 is about 414.8669278670.

The spelling of 71404642 in words is "seventy-one million, four hundred four thousand, six hundred forty-two".