66402642 has 32 divisors (see below), whose sum is σ = 137653632. Its totient is φ = 21337344.

The previous prime is 66402607. The next prime is 66402643. The reversal of 66402642 is 24620466.

It is not an unprimeable number, because it can be changed into a prime (66402643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23763 + ... + 26409.

It is an arithmetic number, because the mean of its divisors is an integer number (4301676).

Almost surely, 2^66402642 is an apocalyptic number.

66402642 is an abundant number, since it is smaller than the sum of its proper divisors (71250990).

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

66402642 is a wasteful number, since it uses less digits than its factorization.

66402642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 66402642 is about 8148.7816267219. The cubic root of 66402642 is about 404.9441410539.

The spelling of 66402642 in words is "sixty-six million, four hundred two thousand, six hundred forty-two".