66640034 has 16 divisors (see below), whose sum is σ = 108702648. Its totient is φ = 30511872.

The previous prime is 66640019. The next prime is 66640043. The reversal of 66640034 is 43004666.

It can be written as a sum of positive squares in 4 ways, for example, as 63760225 + 2879809 = 7985^2 + 1697^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66639979 and 66640006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25229 + ... + 27744.

Almost surely, 2^66640034 is an apocalyptic number.

66640034 is a deficient number, since it is larger than the sum of its proper divisors (42062614).

66640034 is a wasteful number, since it uses less digits than its factorization.

66640034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53029.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 66640034 is about 8163.3347352660. The cubic root of 66640034 is about 405.4261307603.

It can be divided in two parts, 666400 and 34, that multiplied together give a square (22657600 = 4760²).

The spelling of 66640034 in words is "sixty-six million, six hundred forty thousand, thirty-four".