42726645 has 24 divisors (see below), whose sum is σ = 79757496. Its totient is φ = 21034368.

The previous prime is 42726631. The next prime is 42726653. The reversal of 42726645 is 54662724.

42726645 is a `hidden beast` number, since 4 + 2 + 7 + 2 + 6 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7193124 + 35533521 = 2682^2 + 5961^2 .

It is not a de Polignac number, because 42726645 - 2⁵ = 42726613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35934 + ... + 37103.

It is an arithmetic number, because the mean of its divisors is an integer number (3323229).

Almost surely, 2^42726645 is an apocalyptic number.

42726645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42726645 is a deficient number, since it is larger than the sum of its proper divisors (37030851).

42726645 is a wasteful number, since it uses less digits than its factorization.

42726645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73061 (or 73058 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The square root of 42726645 is about 6536.5621698260. The cubic root of 42726645 is about 349.5958464188.

It can be divided in two parts, 427 and 26645, that added together give a palindrome (27072).

The spelling of 42726645 in words is "forty-two million, seven hundred twenty-six thousand, six hundred forty-five".