71072289 has 32 divisors (see below), whose sum is σ = 108051840. Its totient is φ = 46158336.

The previous prime is 71072279. The next prime is 71072317. The reversal of 71072289 is 98227017.

It is not a de Polignac number, because 71072289 - 2⁴ = 71072273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71072269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210729 + ... + 211065.

It is an arithmetic number, because the mean of its divisors is an integer number (3376620).

Almost surely, 2^71072289 is an apocalyptic number.

It is an amenable number.

71072289 is a deficient number, since it is larger than the sum of its proper divisors (36979551).

71072289 is a wasteful number, since it uses less digits than its factorization.

71072289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 520 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 71072289 is about 8430.4382448364. The cubic root of 71072289 is about 414.2222604079. Note that the first 4 decimals are identical.

The spelling of 71072289 in words is "seventy-one million, seventy-two thousand, two hundred eighty-nine".