82278066 has 64 divisors (see below), whose sum is σ = 182891520. Its totient is φ = 24521280.

The previous prime is 82278013. The next prime is 82278067. The reversal of 82278066 is 66087228.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (82278067) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 459565 + ... + 459743.

It is an arithmetic number, because the mean of its divisors is an integer number (2857680).

Almost surely, 2^82278066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82278066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91445760).

82278066 is an abundant number, since it is smaller than the sum of its proper divisors (100613454).

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

82278066 is a wasteful number, since it uses less digits than its factorization.

82278066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 82278066 is about 9070.7257703009. The cubic root of 82278066 is about 434.9386728182.

The spelling of 82278066 in words is "eighty-two million, two hundred seventy-eight thousand, sixty-six".