71668020 has 48 divisors (see below), whose sum is σ = 201821760. Its totient is φ = 19001856.

The previous prime is 71667991. The next prime is 71668021. The reversal of 71668020 is 2086617.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71668021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7404 + ... + 14076.

It is an arithmetic number, because the mean of its divisors is an integer number (4204620).

Almost surely, 2^71668020 is an apocalyptic number.

It is an amenable number.

71668020 is an abundant number, since it is smaller than the sum of its proper divisors (130153740).

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

71668020 is a wasteful number, since it uses less digits than its factorization.

71668020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6864 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 71668020 is about 8465.6966635948. The cubic root of 71668020 is about 415.3763847161.

The spelling of 71668020 in words is "seventy-one million, six hundred sixty-eight thousand, twenty".