42609780 has 96 divisors (see below), whose sum is σ = 139574400. Its totient is φ = 10761984.

The previous prime is 42609773. The next prime is 42609797. The reversal of 42609780 is 8790624.

42609780 is a `hidden beast` number, since 42 + 609 + 7 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8184 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (1453900).

Almost surely, 2^42609780 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 42609780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69787200).

42609780 is an abundant number, since it is smaller than the sum of its proper divisors (96964620).

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

42609780 is a wasteful number, since it uses less digits than its factorization.

42609780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4182 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 42609780 is about 6527.6167166892. The cubic root of 42609780 is about 349.2768196979.

The spelling of 42609780 in words is "forty-two million, six hundred nine thousand, seven hundred eighty".