42551730 has 112 divisors (see below), whose sum is σ = 123946200. Its totient is φ = 10450944.

The previous prime is 42551723. The next prime is 42551749. The reversal of 42551730 is 3715524.

It is a happy number.

42551730 is a `hidden beast` number, since 42 + 551 + 73 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 28869129 + 13682601 = 5373^2 + 3699^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 42551694 and 42551703.

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 55 ways as a sum of consecutive naturals, for example, 94546 + ... + 94994.

Almost surely, 2^42551730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42551730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61973100).

42551730 is an abundant number, since it is smaller than the sum of its proper divisors (81394470).

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

42551730 is a wasteful number, since it uses less digits than its factorization.

42551730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 42551730 is about 6523.1687085342. The cubic root of 42551730 is about 349.1181336412.

The spelling of 42551730 in words is "forty-two million, five hundred fifty-one thousand, seven hundred thirty".