66491392 has 44 divisors (see below), whose sum is σ = 145025856. Its totient is φ = 30218240.

The previous prime is 66491389. The next prime is 66491419. The reversal of 66491392 is 29319466.

It is a tau number, because it is divible by the number of its divisors (44).

It is a super-2 number, since 2×66491392² = 8842210420195328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8313 + ... + 14215.

Almost surely, 2^66491392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66491392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72512928).

66491392 is an abundant number, since it is smaller than the sum of its proper divisors (78534464).

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

66491392 is a wasteful number, since it uses less digits than its factorization.

66491392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5934 (or 5916 counting only the distinct ones).

The product of its digits is 69984, while the sum is 40.

The square root of 66491392 is about 8154.2254077257. The cubic root of 66491392 is about 405.1244691858.

The spelling of 66491392 in words is "sixty-six million, four hundred ninety-one thousand, three hundred ninety-two".