66402868 has 48 divisors (see below), whose sum is σ = 138507264. Its totient is φ = 27256320.

The previous prime is 66402857. The next prime is 66402871. The reversal of 66402868 is 86820466.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66402868.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97746 + ... + 98422.

It is an arithmetic number, because the mean of its divisors is an integer number (2885568).

Almost surely, 2^66402868 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 66402868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69253632).

66402868 is an abundant number, since it is smaller than the sum of its proper divisors (72104396).

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

66402868 is a wasteful number, since it uses less digits than its factorization.

66402868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 830 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 66402868 is about 8148.7954938138. The cubic root of 66402868 is about 404.9446004597.

The spelling of 66402868 in words is "sixty-six million, four hundred two thousand, eight hundred sixty-eight".