71804449 has 6 divisors (see below), whose sum is σ = 72152210. Its totient is φ = 71457936.

The previous prime is 71804437. The next prime is 71804461. The reversal of 71804449 is 94440817.

It is an interprime number because it is at equal distance from previous prime (71804437) and next prime (71804461).

It can be written as a sum of positive squares in only one way, i.e., 70224400 + 1580049 = 8380^2 + 1257^2 .

It is not a de Polignac number, because 71804449 - 2⁵ = 71804417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71804419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171162 + ... + 171580.

Almost surely, 2^71804449 is an apocalyptic number.

It is an amenable number.

71804449 is a deficient number, since it is larger than the sum of its proper divisors (347761).

71804449 is an frugal number, since it uses more digits than its factorization.

71804449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 71804449 is about 8473.7505863697. The cubic root of 71804449 is about 415.6397912010.

The spelling of 71804449 in words is "seventy-one million, eight hundred four thousand, four hundred forty-nine".