42816557 has 32 divisors (see below), whose sum is σ = 56505600. Its totient is φ = 31546368.

The previous prime is 42816541. The next prime is 42816559. The reversal of 42816557 is 75561824.

It is not a de Polignac number, because 42816557 - 2⁴ = 42816541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42816557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42816559) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65243 + ... + 65895.

It is an arithmetic number, because the mean of its divisors is an integer number (1765800).

Almost surely, 2^42816557 is an apocalyptic number.

It is an amenable number.

42816557 is a deficient number, since it is larger than the sum of its proper divisors (13689043).

42816557 is a wasteful number, since it uses less digits than its factorization.

42816557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725.

The product of its digits is 67200, while the sum is 38.

The square root of 42816557 is about 6543.4361768111. The cubic root of 42816557 is about 349.8408991164.

The spelling of 42816557 in words is "forty-two million, eight hundred sixteen thousand, five hundred fifty-seven".