71679621 has 32 divisors (see below), whose sum is σ = 105598080. Its totient is φ = 42983424.

The previous prime is 71679607. The next prime is 71679703. The reversal of 71679621 is 12697617.

It is not a de Polignac number, because 71679621 - 2⁵ = 71679589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71679621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71679821) 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 31 ways as a sum of consecutive naturals, for example, 371301 + ... + 371493.

It is an arithmetic number, because the mean of its divisors is an integer number (3299940).

Almost surely, 2^71679621 is an apocalyptic number.

It is an amenable number.

71679621 is a deficient number, since it is larger than the sum of its proper divisors (33918459).

71679621 is a wasteful number, since it uses less digits than its factorization.

71679621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its digits is 31752, while the sum is 39.

The square root of 71679621 is about 8466.3818127935. The cubic root of 71679621 is about 415.3987960206.

The spelling of 71679621 in words is "seventy-one million, six hundred seventy-nine thousand, six hundred twenty-one".