71898840 has 192 divisors, whose sum is σ = 261424800. Its totient is φ = 17667072.

The previous prime is 71898829. The next prime is 71898857. The reversal of 71898840 is 4889817.

It is a super-3 number, since 3×71898840³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 126076 + ... + 126644.

Almost surely, 2^71898840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71898840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130712400).

71898840 is an abundant number, since it is smaller than the sum of its proper divisors (189525960).

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

71898840 is a wasteful number, since it uses less digits than its factorization.

71898840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 71898840 is about 8479.3183688313. The cubic root of 71898840 is about 415.8218387735.

The spelling of 71898840 in words is "seventy-one million, eight hundred ninety-eight thousand, eight hundred forty".