42628731 has 8 divisors (see below), whose sum is σ = 56890944. Its totient is φ = 28392840.

The previous prime is 42628709. The next prime is 42628759. The reversal of 42628731 is 13782624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42628731 - 2⁶ = 42628667 is a prime.

It is a super-2 number, since 2×42628731² = 3634417413340722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42628692 and 42628701.

It is not an unprimeable number, because it can be changed into a prime (42623731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2425 + ... + 9546.

It is an arithmetic number, because the mean of its divisors is an integer number (7111368).

Almost surely, 2^42628731 is an apocalyptic number.

42628731 is a deficient number, since it is larger than the sum of its proper divisors (14262213).

42628731 is a wasteful number, since it uses less digits than its factorization.

42628731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13161.

The product of its digits is 16128, while the sum is 33.

The square root of 42628731 is about 6529.0681570956. The cubic root of 42628731 is about 349.3285931323.

The spelling of 42628731 in words is "forty-two million, six hundred twenty-eight thousand, seven hundred thirty-one".