42644660 has 12 divisors (see below), whose sum is σ = 89553828. Its totient is φ = 17057856.

The previous prime is 42644639. The next prime is 42644663. The reversal of 42644660 is 6644624.

It can be written as a sum of positive squares in 2 ways, for example, as 23600164 + 19044496 = 4858^2 + 4364^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644663) 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, 1066097 + ... + 1066136.

It is an arithmetic number, because the mean of its divisors is an integer number (7462819).

Almost surely, 2^42644660 is an apocalyptic number.

It is an amenable number.

42644660 is an abundant number, since it is smaller than the sum of its proper divisors (46909168).

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

42644660 is a wasteful number, since it uses less digits than its factorization.

42644660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132242 (or 2132240 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 42644660 is about 6530.2878956444. The cubic root of 42644660 is about 349.3720987062.

The spelling of 42644660 in words is "forty-two million, six hundred forty-four thousand, six hundred sixty".