66602406 has 32 divisors (see below), whose sum is σ = 144506880. Its totient is φ = 20342304.

The previous prime is 66602401. The next prime is 66602441. The reversal of 66602406 is 60420666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66602401) 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, 7771 + ... + 13913.

It is an arithmetic number, because the mean of its divisors is an integer number (4515840).

Almost surely, 2^66602406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66602406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72253440).

66602406 is an abundant number, since it is smaller than the sum of its proper divisors (77904474).

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

66602406 is a wasteful number, since it uses less digits than its factorization.

66602406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6300.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 66602406 is about 8161.0297144417. The cubic root of 66602406 is about 405.3498090374.

It can be divided in two parts, 6 and 6602406, that multiplied together give a square (39614436 = 6294²).

The spelling of 66602406 in words is "sixty-six million, six hundred two thousand, four hundred six".