82128078 has 24 divisors (see below), whose sum is σ = 185681808. Its totient is φ = 26185632.

The previous prime is 82128077. The next prime is 82128091. The reversal of 82128078 is 87082128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82128077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98775 + ... + 99602.

It is an arithmetic number, because the mean of its divisors is an integer number (7736742).

Almost surely, 2^82128078 is an apocalyptic number.

82128078 is an abundant number, since it is smaller than the sum of its proper divisors (103553730).

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

82128078 is a wasteful number, since it uses less digits than its factorization.

82128078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198408 (or 198405 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 82128078 is about 9062.4543033331. The cubic root of 82128078 is about 434.6742229869.

It can be divided in two parts, 8212 and 8078, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 82128078 in words is "eighty-two million, one hundred twenty-eight thousand, seventy-eight".