42057631 has 32 divisors (see below), whose sum is σ = 54604800. Its totient is φ = 32104800.

The previous prime is 42057629. The next prime is 42057671. The reversal of 42057631 is 13675024.

It is not a de Polignac number, because 42057631 - 2¹ = 42057629 is a prime.

It is a super-2 number, since 2×42057631² = 3537688650664322, which contains 22 as substring.

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 42057631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42057671) 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, 267805 + ... + 267961.

It is an arithmetic number, because the mean of its divisors is an integer number (1706400).

Almost surely, 2^42057631 is an apocalyptic number.

42057631 is a deficient number, since it is larger than the sum of its proper divisors (12547169).

42057631 is a wasteful number, since it uses less digits than its factorization.

42057631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 42057631 is about 6485.1855023584. The cubic root of 42057631 is about 347.7615814204.

The spelling of 42057631 in words is "forty-two million, fifty-seven thousand, six hundred thirty-one".