42643544 has 8 divisors (see below), whose sum is σ = 79956660. Its totient is φ = 21321768.

The previous prime is 42643537. The next prime is 42643547. The reversal of 42643544 is 44534624.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 42643544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42643547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665214 + ... + 2665229.

Almost surely, 2^42643544 is an apocalyptic number.

It is an amenable number.

42643544 is a deficient number, since it is larger than the sum of its proper divisors (37313116).

42643544 is a wasteful number, since it uses less digits than its factorization.

42643544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330449 (or 5330445 counting only the distinct ones).

The product of its digits is 46080, while the sum is 32.

The square root of 42643544 is about 6530.2024470915. The cubic root of 42643544 is about 349.3690510197.

The spelling of 42643544 in words is "forty-two million, six hundred forty-three thousand, five hundred forty-four".