71864389 has 4 divisors (see below), whose sum is σ = 76091724. Its totient is φ = 67637056.

The previous prime is 71864381. The next prime is 71864393. The reversal of 71864389 is 98346817.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98346817 = 193 ⋅509569.

It can be written as a sum of positive squares in 2 ways, for example, as 22724289 + 49140100 = 4767^2 + 7010^2 .

It is a cyclic number.

It is not a de Polignac number, because 71864389 - 2³ = 71864381 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 (71864381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113642 + ... + 2113675.

It is an arithmetic number, because the mean of its divisors is an integer number (19022931).

Almost surely, 2^71864389 is an apocalyptic number.

It is an amenable number.

71864389 is a deficient number, since it is larger than the sum of its proper divisors (4227335).

71864389 is a wasteful number, since it uses less digits than its factorization.

71864389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4227334.

The product of its digits is 290304, while the sum is 46.

The square root of 71864389 is about 8477.2866531692. The cubic root of 71864389 is about 415.7554131917.

The spelling of 71864389 in words is "seventy-one million, eight hundred sixty-four thousand, three hundred eighty-nine".