66417078 has 64 divisors (see below), whose sum is σ = 165215232. Its totient is φ = 17331840.

The previous prime is 66417059. The next prime is 66417083. The reversal of 66417078 is 87071466.

It is a super-2 number, since 2×66417078² = 8822456500116168, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55648 + ... + 56828.

It is an arithmetic number, because the mean of its divisors is an integer number (2581488).

Almost surely, 2^66417078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66417078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82607616).

66417078 is an abundant number, since it is smaller than the sum of its proper divisors (98798154).

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

66417078 is a wasteful number, since it uses less digits than its factorization.

66417078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 66417078 is about 8149.6673551747. The cubic root of 66417078 is about 404.9734840131.

The spelling of 66417078 in words is "sixty-six million, four hundred seventeen thousand, seventy-eight".