66426040 has 64 divisors (see below), whose sum is σ = 154742400. Its totient is φ = 25648128.

The previous prime is 66426007. The next prime is 66426049. The reversal of 66426040 is 4062466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426049) 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, 167122 + ... + 167518.

It is an arithmetic number, because the mean of its divisors is an integer number (2417850).

Almost surely, 2^66426040 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 66426040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77371200).

66426040 is an abundant number, since it is smaller than the sum of its proper divisors (88316360).

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

66426040 is a wasteful number, since it uses less digits than its factorization.

66426040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66426040 is about 8150.2171750206. The cubic root of 66426040 is about 404.9916982498.

The spelling of 66426040 in words is "sixty-six million, four hundred twenty-six thousand, forty".