71634921 has 8 divisors (see below), whose sum is σ = 100540320. Its totient is φ = 45243072.

The previous prime is 71634917. The next prime is 71634931. The reversal of 71634921 is 12943617.

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

It is not a de Polignac number, because 71634921 - 2² = 71634917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71634931) 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, 628320 + ... + 628433.

It is an arithmetic number, because the mean of its divisors is an integer number (12567540).

Almost surely, 2^71634921 is an apocalyptic number.

It is an amenable number.

71634921 is a deficient number, since it is larger than the sum of its proper divisors (28905399).

71634921 is a wasteful number, since it uses less digits than its factorization.

71634921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256775.

The product of its digits is 9072, while the sum is 33.

The square root of 71634921 is about 8463.7415485115. The cubic root of 71634921 is about 415.3124293655.

The spelling of 71634921 in words is "seventy-one million, six hundred thirty-four thousand, nine hundred twenty-one".