71388669 has 12 divisors (see below), whose sum is σ = 104625248. Its totient is φ = 43265640.

The previous prime is 71388631. The next prime is 71388673. The reversal of 71388669 is 96688317.

It is not a de Polignac number, because 71388669 - 2²³ = 63000061 is a prime.

It is a super-2 number, since 2×71388669² = 10192684123183122, 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 (71388679) 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, 97969 + ... + 98694.

Almost surely, 2^71388669 is an apocalyptic number.

It is an amenable number.

71388669 is a deficient number, since it is larger than the sum of its proper divisors (33236579).

71388669 is a wasteful number, since it uses less digits than its factorization.

71388669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196688 (or 196677 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 71388669 is about 8449.1815579972. The cubic root of 71388669 is about 414.8359907391.

The spelling of 71388669 in words is "seventy-one million, three hundred eighty-eight thousand, six hundred sixty-nine".