71666004 has 24 divisors (see below), whose sum is σ = 169102080. Its totient is φ = 23619904.

The previous prime is 71665987. The next prime is 71666009. The reversal of 71666004 is 40066617.

71666004 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×71666004² = 10272032258656032, which contains 22 as substring.

71666004 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71666009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32484 + ... + 34619.

It is an arithmetic number, because the mean of its divisors is an integer number (7045920).

Almost surely, 2^71666004 is an apocalyptic number.

It is an amenable number.

71666004 is an abundant number, since it is smaller than the sum of its proper divisors (97436076).

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

71666004 is a wasteful number, since it uses less digits than its factorization.

71666004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67199 (or 67197 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 71666004 is about 8465.5775939979. The cubic root of 71666004 is about 415.3724898750.

The spelling of 71666004 in words is "seventy-one million, six hundred sixty-six thousand, four".