71712545 has 8 divisors (see below), whose sum is σ = 91117224. Its totient is φ = 53995264.

The previous prime is 71712533. The next prime is 71712547. The reversal of 71712545 is 54521717.

It can be written as a sum of positive squares in 4 ways, for example, as 34245904 + 37466641 = 5852^2 + 6121^2 .

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

It is not a de Polignac number, because 71712545 - 2⁶ = 71712481 is a prime.

It is a super-2 number, since 2×71712545² = 10285378220754050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71712547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421754 + ... + 421923.

It is an arithmetic number, because the mean of its divisors is an integer number (11389653).

Almost surely, 2^71712545 is an apocalyptic number.

It is an amenable number.

71712545 is a deficient number, since it is larger than the sum of its proper divisors (19404679).

71712545 is a wasteful number, since it uses less digits than its factorization.

71712545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843699.

The product of its digits is 9800, while the sum is 32.

The square root of 71712545 is about 8468.3259856952. The cubic root of 71712545 is about 415.4623868354.

The spelling of 71712545 in words is "seventy-one million, seven hundred twelve thousand, five hundred forty-five".