71685828 has 36 divisors (see below), whose sum is σ = 181751388. Its totient is φ = 23823360.

The previous prime is 71685799. The next prime is 71685847. The reversal of 71685828 is 82858617.

71685828 is a `hidden beast` number, since 7 + 1 + 68 + 582 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55621764 + 16064064 = 7458^2 + 4008^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9888 + ... + 15528.

Almost surely, 2^71685828 is an apocalyptic number.

It is an amenable number.

71685828 is an abundant number, since it is smaller than the sum of its proper divisors (110065560).

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

71685828 is a wasteful number, since it uses less digits than its factorization.

71685828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6004 (or 5999 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 71685828 is about 8466.7483723092. The cubic root of 71685828 is about 415.4107859738.

It can be divided in two parts, 7168 and 5828, that added together give a square (12996 = 114²).

The spelling of 71685828 in words is "seventy-one million, six hundred eighty-five thousand, eight hundred twenty-eight".