66804634 has 16 divisors (see below), whose sum is σ = 108482472. Its totient is φ = 30670848.

The previous prime is 66804631. The next prime is 66804637. The reversal of 66804634 is 43640866.

It is an interprime number because it is at equal distance from previous prime (66804631) and next prime (66804637).

It can be written as a sum of positive squares in 4 ways, for example, as 32547025 + 34257609 = 5705^2 + 5853^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66804593 and 66804602.

It is not an unprimeable number, because it can be changed into a prime (66804631) 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, 1639 + ... + 11674.

Almost surely, 2^66804634 is an apocalyptic number.

66804634 is a deficient number, since it is larger than the sum of its proper divisors (41677838).

66804634 is a wasteful number, since it uses less digits than its factorization.

66804634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13521.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 66804634 is about 8173.4101818029. The cubic root of 66804634 is about 405.7596553654.

The spelling of 66804634 in words is "sixty-six million, eight hundred four thousand, six hundred thirty-four".