71724621 has 8 divisors (see below), whose sum is σ = 97965504. Its totient is φ = 46650080.

The previous prime is 71724599. The next prime is 71724629. The reversal of 71724621 is 12642717.

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

It is a cyclic number.

It is not a de Polignac number, because 71724621 - 2⁷ = 71724493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71724629) 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, 291441 + ... + 291686.

It is an arithmetic number, because the mean of its divisors is an integer number (12245688).

Almost surely, 2^71724621 is an apocalyptic number.

It is an amenable number.

71724621 is a deficient number, since it is larger than the sum of its proper divisors (26240883).

71724621 is a wasteful number, since it uses less digits than its factorization.

71724621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583171.

The product of its digits is 4704, while the sum is 30.

The square root of 71724621 is about 8469.0389655498. The cubic root of 71724621 is about 415.4857060570.

The spelling of 71724621 in words is "seventy-one million, seven hundred twenty-four thousand, six hundred twenty-one".