71881000 has 32 divisors (see below), whose sum is σ = 168203880. Its totient is φ = 28752000.

The previous prime is 71880967. The next prime is 71881021. The reversal of 71881000 is 18817.

It can be written as a sum of positive squares in 4 ways, for example, as 3090564 + 68790436 = 1758^2 + 8294^2 .

It is a super-2 number, since 2×71881000² = 10333756322000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34941 + ... + 36940.

Almost surely, 2^71881000 is an apocalyptic number.

It is an amenable number.

71881000 is an abundant number, since it is smaller than the sum of its proper divisors (96322880).

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

71881000 is a wasteful number, since it uses less digits than its factorization.

71881000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71902 (or 71888 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 71881000 is about 8478.2663322167. The cubic root of 71881000 is about 415.7874438039.

Adding to 71881000 its reverse (18817), we get a palindrome (71899817).

It can be divided in two parts, 718 and 81000, that added together give a palindrome (81718).

The spelling of 71881000 in words is "seventy-one million, eight hundred eighty-one thousand".