71988405 has 8 divisors (see below), whose sum is σ = 115181472. Its totient is φ = 38393808.

The previous prime is 71988401. The next prime is 71988409. The reversal of 71988405 is 50488917.

It is an interprime number because it is at equal distance from previous prime (71988401) and next prime (71988409).

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

It is not a de Polignac number, because 71988405 - 2² = 71988401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71988401) 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, 2399599 + ... + 2399628.

It is an arithmetic number, because the mean of its divisors is an integer number (14397684).

Almost surely, 2^71988405 is an apocalyptic number.

It is an amenable number.

71988405 is a deficient number, since it is larger than the sum of its proper divisors (43193067).

71988405 is a wasteful number, since it uses less digits than its factorization.

71988405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4799235.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 71988405 is about 8484.5981048014. The cubic root of 71988405 is about 415.9944314004.

The spelling of 71988405 in words is "seventy-one million, nine hundred eighty-eight thousand, four hundred five".