42645730 has 16 divisors (see below), whose sum is σ = 76893624. Its totient is φ = 17029120.

The previous prime is 42645683. The next prime is 42645751. The reversal of 42645730 is 3754624.

It can be written as a sum of positive squares in 4 ways, for example, as 31214569 + 11431161 = 5587^2 + 3381^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42645692 and 42645701.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3084 + ... + 9736.

Almost surely, 2^42645730 is an apocalyptic number.

42645730 is a deficient number, since it is larger than the sum of its proper divisors (34247894).

42645730 is a wasteful number, since it uses less digits than its factorization.

42645730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7301.

The product of its (nonzero) digits is 20160, while the sum is 31.

The square root of 42645730 is about 6530.3698210745. The cubic root of 42645730 is about 349.3750207213.

The spelling of 42645730 in words is "forty-two million, six hundred forty-five thousand, seven hundred thirty".