66427644 has 12 divisors (see below), whose sum is σ = 154997864. Its totient is φ = 22142544.

The previous prime is 66427643. The next prime is 66427649. The reversal of 66427644 is 44672466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66427643) 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, 2767807 + ... + 2767830.

Almost surely, 2^66427644 is an apocalyptic number.

It is an amenable number.

66427644 is an abundant number, since it is smaller than the sum of its proper divisors (88570220).

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

66427644 is a wasteful number, since it uses less digits than its factorization.

66427644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535644 (or 5535642 counting only the distinct ones).

The product of its digits is 193536, while the sum is 39.

The square root of 66427644 is about 8150.3155767124. The cubic root of 66427644 is about 404.9949580229.

The spelling of 66427644 in words is "sixty-six million, four hundred twenty-seven thousand, six hundred forty-four".