42478631 has 32 divisors (see below), whose sum is σ = 51746688. Its totient is φ = 34467840.

The previous prime is 42478613. The next prime is 42478633. The reversal of 42478631 is 13687424.

It is not a de Polignac number, because 42478631 - 2¹⁸ = 42216487 is a prime.

It is a super-2 number, since 2×42478631² = 3608868183268322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 42478591 and 42478600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42478633) 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, 309995 + ... + 310131.

It is an arithmetic number, because the mean of its divisors is an integer number (1617084).

Almost surely, 2^42478631 is an apocalyptic number.

42478631 is a deficient number, since it is larger than the sum of its proper divisors (9268057).

42478631 is a wasteful number, since it uses less digits than its factorization.

42478631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251.

The product of its digits is 32256, while the sum is 35.

The square root of 42478631 is about 6517.5632716530. The cubic root of 42478631 is about 348.9181040615.

The spelling of 42478631 in words is "forty-two million, four hundred seventy-eight thousand, six hundred thirty-one".