71238445 has 4 divisors (see below), whose sum is σ = 85486140. Its totient is φ = 56990752.

The previous prime is 71238439. The next prime is 71238451. The reversal of 71238445 is 54483217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54483217 = 2377 ⋅22921.

It is an interprime number because it is at equal distance from previous prime (71238439) and next prime (71238451).

It can be written as a sum of positive squares in 2 ways, for example, as 16152361 + 55086084 = 4019^2 + 7422^2 .

It is a cyclic number.

It is not a de Polignac number, because 71238445 - 2¹¹ = 71236397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71238445.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7123840 + ... + 7123849.

It is an arithmetic number, because the mean of its divisors is an integer number (21371535).

Almost surely, 2^71238445 is an apocalyptic number.

It is an amenable number.

71238445 is a deficient number, since it is larger than the sum of its proper divisors (14247695).

71238445 is a wasteful number, since it uses less digits than its factorization.

71238445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14247694.

The product of its digits is 26880, while the sum is 34.

The square root of 71238445 is about 8440.2870211860. The cubic root of 71238445 is about 414.5448050075.

The spelling of 71238445 in words is "seventy-one million, two hundred thirty-eight thousand, four hundred forty-five".