66703644 has 36 divisors (see below), whose sum is σ = 192700144. Its totient is φ = 19058112.

The previous prime is 66703639. The next prime is 66703667. The reversal of 66703644 is 44630766.

66703644 is a `hidden beast` number, since 6 + 6 + 7 + 0 + 3 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×66703644² = 8898752245757472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66703599 and 66703608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132097 + ... + 132600.

Almost surely, 2^66703644 is an apocalyptic number.

It is an amenable number.

66703644 is an abundant number, since it is smaller than the sum of its proper divisors (125996500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66703644 is a wasteful number, since it uses less digits than its factorization.

66703644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264714 (or 264709 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 66703644 is about 8167.2298853406. The cubic root of 66703644 is about 405.5550870521. Note that the first 3 decimals are identical.

The spelling of 66703644 in words is "sixty-six million, seven hundred three thousand, six hundred forty-four".