66619392 has 96 divisors (see below), whose sum is σ = 203112000. Its totient is φ = 19021824.

The previous prime is 66619367. The next prime is 66619393. The reversal of 66619392 is 29391666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (66619393) 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, 42234 + ... + 43782.

It is an arithmetic number, because the mean of its divisors is an integer number (2115750).

Almost surely, 2^66619392 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 66619392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101556000).

66619392 is an abundant number, since it is smaller than the sum of its proper divisors (136492608).

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

66619392 is a wasteful number, since it uses less digits than its factorization.

66619392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1561 counting only the distinct ones).

The product of its digits is 104976, while the sum is 42.

The square root of 66619392 is about 8162.0703255975. The cubic root of 66619392 is about 405.3842656835.

The spelling of 66619392 in words is "sixty-six million, six hundred nineteen thousand, three hundred ninety-two".