71720438 has 8 divisors (see below), whose sum is σ = 107616600. Its totient is φ = 35848240.

The previous prime is 71720413. The next prime is 71720443. The reversal of 71720438 is 83402717.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8633 + ... + 14763.

It is an arithmetic number, because the mean of its divisors is an integer number (13452075).

Almost surely, 2^71720438 is an apocalyptic number.

71720438 is a deficient number, since it is larger than the sum of its proper divisors (35896162).

71720438 is a wasteful number, since it uses less digits than its factorization.

71720438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11982.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 71720438 is about 8468.7920035859. The cubic root of 71720438 is about 415.4776288190.

The spelling of 71720438 in words is "seventy-one million, seven hundred twenty thousand, four hundred thirty-eight".