71988025 has 6 divisors (see below), whose sum is σ = 89265182. Its totient is φ = 57590400.

The previous prime is 71988023. The next prime is 71988029. The reversal of 71988025 is 52088917.

It can be written as a sum of positive squares in 3 ways, for example, as 16679056 + 55308969 = 4084^2 + 7437^2 .

It is not a de Polignac number, because 71988025 - 2¹ = 71988023 is a prime.

It is a super-3 number, since 3×71988025³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71988023) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1439736 + ... + 1439785.

Almost surely, 2^71988025 is an apocalyptic number.

It is an amenable number.

71988025 is a deficient number, since it is larger than the sum of its proper divisors (17277157).

71988025 is a wasteful number, since it uses less digits than its factorization.

71988025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879531 (or 2879526 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 71988025 is about 8484.5757112539. The cubic root of 71988025 is about 415.9936994392.

It can be divided in two parts, 719880 and 25, that multiplied together give a triangular number (17997000 = T₅₉₉₉).

The spelling of 71988025 in words is "seventy-one million, nine hundred eighty-eight thousand, twenty-five".