71897450769 has 21 divisors (see below), whose sum is σ = 107807719449. Its totient is φ = 47926807380.

The previous prime is 71897450759. The next prime is 71897450791. The reversal of 71897450769 is 96705479817.

The square root of 71897450769 is 268137.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 71897450769 - 2⁷ = 71897450641 is a prime.

It is a super-2 number, since 2×71897450769² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71897450759) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 7234734 + ... + 7244664.

Almost surely, 2^71897450769 is an apocalyptic number.

71897450769 is the 268137-th square number.

71897450769 is the 134069-th centered octagonal number.

It is an amenable number.

71897450769 is a deficient number, since it is larger than the sum of its proper divisors (35910268680).

71897450769 is an frugal number, since it uses more digits than its factorization.

71897450769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19880 (or 9934 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 63.

The spelling of 71897450769 in words is "seventy-one billion, eight hundred ninety-seven million, four hundred fifty thousand, seven hundred sixty-nine".