42621660 has 48 divisors (see below), whose sum is σ = 132602400. Its totient is φ = 11365632.

The previous prime is 42621653. The next prime is 42621661. The reversal of 42621660 is 6612624.

It is a happy number.

42621660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42621661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38925 + ... + 40004.

It is an arithmetic number, because the mean of its divisors is an integer number (2762550).

Almost surely, 2^42621660 is an apocalyptic number.

It is an amenable number.

42621660 is an abundant number, since it is smaller than the sum of its proper divisors (89980740).

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

42621660 is a wasteful number, since it uses less digits than its factorization.

42621660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78947 (or 78939 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 42621660 is about 6528.5266331692. The cubic root of 42621660 is about 349.3092772155.

The spelling of 42621660 in words is "forty-two million, six hundred twenty-one thousand, six hundred sixty".