42642634 has 16 divisors (see below), whose sum is σ = 65440872. Its totient is φ = 20832448.

The previous prime is 42642629. The next prime is 42642637. The reversal of 42642634 is 43624624.

42642634 = 226² + 227² + ... + 518².

It can be written as a sum of positive squares in 4 ways, for example, as 38007225 + 4635409 = 6165^2 + 2153^2 .

It is a junction number, because it is equal to n+sod(n) for n = 42642596 and 42642605.

It is not an unprimeable number, because it can be changed into a prime (42642637) 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, 30372 + ... + 31744.

Almost surely, 2^42642634 is an apocalyptic number.

42642634 is a deficient number, since it is larger than the sum of its proper divisors (22798238).

42642634 is a wasteful number, since it uses less digits than its factorization.

42642634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

The product of its digits is 27648, while the sum is 31.

The square root of 42642634 is about 6530.1327704726. The cubic root of 42642634 is about 349.3665658596.

The spelling of 42642634 in words is "forty-two million, six hundred forty-two thousand, six hundred thirty-four".