66278598 has 24 divisors (see below), whose sum is σ = 134719368. Its totient is φ = 21734208.

The previous prime is 66278587. The next prime is 66278599. The reversal of 66278598 is 89587266.

It is a self number, because there is not a number n which added to its sum of digits gives 66278598.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66278599) 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, 170188 + ... + 170576.

It is an arithmetic number, because the mean of its divisors is an integer number (5613307).

Almost surely, 2^66278598 is an apocalyptic number.

66278598 is an abundant number, since it is smaller than the sum of its proper divisors (68440770).

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

66278598 is an equidigital number, since it uses as much as digits as its factorization.

66278598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 467 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 66278598 is about 8141.1668696815. The cubic root of 66278598 is about 404.6918308039.

It can be divided in two parts, 6627 and 8598, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 66278598 in words is "sixty-six million, two hundred seventy-eight thousand, five hundred ninety-eight".