66489770 has 8 divisors (see below), whose sum is σ = 119681604. Its totient is φ = 26595904.

The previous prime is 66489769. The next prime is 66489809. The reversal of 66489770 is 7798466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 64464841 + 2024929 = 8029^2 + 1423^2 .

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

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, 3324479 + ... + 3324498.

Almost surely, 2^66489770 is an apocalyptic number.

66489770 is a deficient number, since it is larger than the sum of its proper divisors (53191834).

66489770 is a wasteful number, since it uses less digits than its factorization.

66489770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6648984.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 66489770 is about 8154.1259494810. The cubic root of 66489770 is about 405.1211749386.

It can be divided in two parts, 66 and 489770, that multiplied together give a triangular number (32324820 = T₈₀₄₀).

The spelling of 66489770 in words is "sixty-six million, four hundred eighty-nine thousand, seven hundred seventy".