71421287 has 8 divisors (see below), whose sum is σ = 84439200. Its totient is φ = 59107104.

The previous prime is 71421283. The next prime is 71421289. The reversal of 71421287 is 78212417.

It is a happy number.

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

It is not a de Polignac number, because 71421287 - 2² = 71421283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71421281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175712 + ... + 176117.

It is an arithmetic number, because the mean of its divisors is an integer number (10554900).

Almost surely, 2^71421287 is an apocalyptic number.

71421287 is a deficient number, since it is larger than the sum of its proper divisors (13017913).

71421287 is a wasteful number, since it uses less digits than its factorization.

71421287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351865.

The product of its digits is 6272, while the sum is 32.

The square root of 71421287 is about 8451.1115836912. Note that the first 3 decimals coincide. The cubic root of 71421287 is about 414.8991616420.

The spelling of 71421287 in words is "seventy-one million, four hundred twenty-one thousand, two hundred eighty-seven".