78282666 has 128 divisors (see below), whose sum is σ = 220907520. Its totient is φ = 19958400.

The previous prime is 78282613. The next prime is 78282667. The reversal of 78282666 is 66628287.

It is a happy number.

It is a super-2 number, since 2×78282666² = 12256351592135112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78282667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 278446 + ... + 278726.

It is an arithmetic number, because the mean of its divisors is an integer number (1725840).

Almost surely, 2^78282666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78282666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110453760).

78282666 is an abundant number, since it is smaller than the sum of its proper divisors (142624854).

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

78282666 is a wasteful number, since it uses less digits than its factorization.

78282666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 371 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 78282666 is about 8847.7492053064. The cubic root of 78282666 is about 427.7813721680.

The spelling of 78282666 in words is "seventy-eight million, two hundred eighty-two thousand, six hundred sixty-six".