66578076 has 18 divisors (see below), whose sum is σ = 168294672. Its totient is φ = 22192680.

The previous prime is 66578063. The next prime is 66578087. The reversal of 66578076 is 67087566.

66578076 is a `hidden beast` number, since 6 + 6 + 578 + 0 + 76 = 666.

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

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 924660 + ... + 924731.

It is an arithmetic number, because the mean of its divisors is an integer number (9349704).

Almost surely, 2^66578076 is an apocalyptic number.

It is an amenable number.

66578076 is an abundant number, since it is smaller than the sum of its proper divisors (101716596).

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

66578076 is a wasteful number, since it uses less digits than its factorization.

66578076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849401 (or 1849396 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 66578076 is about 8159.5389575637. The cubic root of 66578076 is about 405.3004446446.

It can be divided in two parts, 665780 and 76, that added together give a square (665856 = 816²).

The spelling of 66578076 in words is "sixty-six million, five hundred seventy-eight thousand, seventy-six".