71779897 has 12 divisors (see below), whose sum is σ = 82811200. Its totient is φ = 60946776.

The previous prime is 71779867. The next prime is 71779907. The reversal of 71779897 is 79897717.

It is not a de Polignac number, because 71779897 - 2¹⁵ = 71747129 is a prime.

It is a super-2 number, since 2×71779897² = 10304707226661218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71779867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316098 + ... + 316324.

Almost surely, 2^71779897 is an apocalyptic number.

It is an amenable number.

71779897 is a deficient number, since it is larger than the sum of its proper divisors (11031303).

71779897 is an equidigital number, since it uses as much as digits as its factorization.

71779897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 433 counting only the distinct ones).

The product of its digits is 1555848, while the sum is 55.

The square root of 71779897 is about 8472.3017533608. The cubic root of 71779897 is about 415.5924127465.

The spelling of 71779897 in words is "seventy-one million, seven hundred seventy-nine thousand, eight hundred ninety-seven".