71572957 has 8 divisors (see below), whose sum is σ = 74699640. Its totient is φ = 68490240.

The previous prime is 71572939. The next prime is 71572967. The reversal of 71572957 is 75927517.

It can be written as a sum of positive squares in 4 ways, for example, as 6625476 + 64947481 = 2574^2 + 8059^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 71572957 - 2¹⁹ = 71048669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71572967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7644 + ... + 14197.

It is an arithmetic number, because the mean of its divisors is an integer number (9337455).

It is a Poulet number, since it divides 2^71572956-1.

Almost surely, 2^71572957 is an apocalyptic number.

It is an amenable number.

71572957 is a deficient number, since it is larger than the sum of its proper divisors (3126683).

71572957 is a wasteful number, since it uses less digits than its factorization.

71572957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21983.

The product of its digits is 154350, while the sum is 43.

The square root of 71572957 is about 8460.0802005655. The cubic root of 71572957 is about 415.1926468039.

The spelling of 71572957 in words is "seventy-one million, five hundred seventy-two thousand, nine hundred fifty-seven".