71720128 has 14 divisors (see below), whose sum is σ = 142319756. Its totient is φ = 35860032.

The previous prime is 71720119. The next prime is 71720137. The reversal of 71720128 is 82102717.

It is an interprime number because it is at equal distance from previous prime (71720119) and next prime (71720137).

It is a junction number, because it is equal to n+sod(n) for n = 71720096 and 71720105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560250 + ... + 560377.

Almost surely, 2^71720128 is an apocalyptic number.

It is an amenable number.

71720128 is a deficient number, since it is larger than the sum of its proper divisors (70599628).

71720128 is a wasteful number, since it uses less digits than its factorization.

71720128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120639 (or 1120629 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 71720128 is about 8468.7737010738. The cubic root of 71720128 is about 415.4770302065.

The spelling of 71720128 in words is "seventy-one million, seven hundred twenty thousand, one hundred twenty-eight".