71720398 has 8 divisors (see below), whose sum is σ = 110204640. Its totient is φ = 34985520.

The previous prime is 71720381. The next prime is 71720413. The reversal of 71720398 is 89302717.

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

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, 437238 + ... + 437401.

It is an arithmetic number, because the mean of its divisors is an integer number (13775580).

Almost surely, 2^71720398 is an apocalyptic number.

71720398 is a deficient number, since it is larger than the sum of its proper divisors (38484242).

71720398 is a wasteful number, since it uses less digits than its factorization.

71720398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874682.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 71720398 is about 8468.7896419736. The cubic root of 71720398 is about 415.4775515788.

It can be divided in two parts, 717 and 20398, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 71720398 in words is "seventy-one million, seven hundred twenty thousand, three hundred ninety-eight".