82188078 has 16 divisors (see below), whose sum is σ = 187858560. Its totient is φ = 23482296.

The previous prime is 82188061. The next prime is 82188083. The reversal of 82188078 is 87088128.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1956859 = 82188078 / (8 + 2 + 1 + 8 + 8 + 0 + 7 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 978388 + ... + 978471.

It is an arithmetic number, because the mean of its divisors is an integer number (11741160).

Almost surely, 2^82188078 is an apocalyptic number.

82188078 is an abundant number, since it is smaller than the sum of its proper divisors (105670482).

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

82188078 is a wasteful number, since it uses less digits than its factorization.

82188078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956871.

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 82188078 is about 9065.7640604640. The cubic root of 82188078 is about 434.7800499887.

The spelling of 82188078 in words is "eighty-two million, one hundred eighty-eight thousand, seventy-eight".