66389406 has 8 divisors (see below), whose sum is σ = 132778824. Its totient is φ = 22129800.

The previous prime is 66389399. The next prime is 66389413. The reversal of 66389406 is 60498366.

It is an interprime number because it is at equal distance from previous prime (66389399) and next prime (66389413).

It is a sphenic number, since it is the product of 3 distinct primes.

66389406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5532445 + ... + 5532456.

It is an arithmetic number, because the mean of its divisors is an integer number (16597353).

Almost surely, 2^66389406 is an apocalyptic number.

66389406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66389406 is a wasteful number, since it uses less digits than its factorization.

66389406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11064906.

The product of its (nonzero) digits is 186624, while the sum is 42.

The square root of 66389406 is about 8147.9694402962. The cubic root of 66389406 is about 404.9172335060.

It can be divided in two parts, 66389 and 406, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 66389406 in words is "sixty-six million, three hundred eighty-nine thousand, four hundred six".