66239642 has 8 divisors (see below), whose sum is σ = 113553696. Its totient is φ = 28388412.

The previous prime is 66239639. The next prime is 66239647. The reversal of 66239642 is 24693266.

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

It is a junction number, because it is equal to n+sod(n) for n = 66239596 and 66239605.

It is not an unprimeable number, because it can be changed into a prime (66239647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2365688 + ... + 2365715.

It is an arithmetic number, because the mean of its divisors is an integer number (14194212).

Almost surely, 2^66239642 is an apocalyptic number.

66239642 is a deficient number, since it is larger than the sum of its proper divisors (47314054).

66239642 is a wasteful number, since it uses less digits than its factorization.

66239642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731412.

The product of its digits is 93312, while the sum is 38.

The square root of 66239642 is about 8138.7739862955. The cubic root of 66239642 is about 404.6125278556.

It can be divided in two parts, 662 and 39642, that added together give a palindrome (40304).

The spelling of 66239642 in words is "sixty-six million, two hundred thirty-nine thousand, six hundred forty-two".