66402884 has 12 divisors (see below), whose sum is σ = 123040764. Its totient is φ = 31248384.

The previous prime is 66402871. The next prime is 66402887. The reversal of 66402884 is 48820466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 34480384 + 31922500 = 5872^2 + 5650^2 .

It is not an unprimeable number, because it can be changed into a prime (66402887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 488189 + ... + 488324.

It is an arithmetic number, because the mean of its divisors is an integer number (10253397).

Almost surely, 2^66402884 is an apocalyptic number.

It is an amenable number.

66402884 is a deficient number, since it is larger than the sum of its proper divisors (56637880).

66402884 is a wasteful number, since it uses less digits than its factorization.

66402884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976534 (or 976532 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 66402884 is about 8148.7964755539. The cubic root of 66402884 is about 404.9446329840.

The spelling of 66402884 in words is "sixty-six million, four hundred two thousand, eight hundred eighty-four".