66120804 has 18 divisors (see below), whose sum is σ = 167138790. Its totient is φ = 22040256.

The previous prime is 66120797. The next prime is 66120829. The reversal of 66120804 is 40802166.

It can be written as a sum of positive squares in only one way, i.e., 60840000 + 5280804 = 7800^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 918309 + ... + 918380.

Almost surely, 2^66120804 is an apocalyptic number.

It is an amenable number.

66120804 is an abundant number, since it is smaller than the sum of its proper divisors (101017986).

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

66120804 is a wasteful number, since it uses less digits than its factorization.

66120804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836699 (or 1836694 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 66120804 is about 8131.4699778084. The cubic root of 66120804 is about 404.3704164067.

The spelling of 66120804 in words is "sixty-six million, one hundred twenty thousand, eight hundred four".