71938280 has 16 divisors (see below), whose sum is σ = 161861220. Its totient is φ = 28775296.

The previous prime is 71938277. The next prime is 71938297. The reversal of 71938280 is 8283917.

It can be written as a sum of positive squares in 2 ways, for example, as 69122596 + 2815684 = 8314^2 + 1678^2 .

It is a super-2 number, since 2×71938280² = 10350232258716800, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 899189 + ... + 899268.

Almost surely, 2^71938280 is an apocalyptic number.

It is an amenable number.

71938280 is an abundant number, since it is smaller than the sum of its proper divisors (89922940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71938280 is a wasteful number, since it uses less digits than its factorization.

71938280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798468 (or 1798464 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 71938280 is about 8481.6437086216. The cubic root of 71938280 is about 415.8978576889.

The spelling of 71938280 in words is "seventy-one million, nine hundred thirty-eight thousand, two hundred eighty".