66486390 has 16 divisors (see below), whose sum is σ = 159567408. Its totient is φ = 17729696.

The previous prime is 66486389. The next prime is 66486391. The reversal of 66486390 is 9368466.

It is an interprime number because it is at equal distance from previous prime (66486389) and next prime (66486391).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66486391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1108077 + ... + 1108136.

It is an arithmetic number, because the mean of its divisors is an integer number (9972963).

Almost surely, 2^66486390 is an apocalyptic number.

66486390 is an abundant number, since it is smaller than the sum of its proper divisors (93081018).

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

66486390 is a wasteful number, since it uses less digits than its factorization.

66486390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216223.

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

The square root of 66486390 is about 8153.9186898080. The cubic root of 66486390 is about 405.1143100592.

The spelling of 66486390 in words is "sixty-six million, four hundred eighty-six thousand, three hundred ninety".