66084880 has 20 divisors (see below), whose sum is σ = 153647532. Its totient is φ = 26433920.

The previous prime is 66084859. The next prime is 66084913. The reversal of 66084880 is 8848066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16128256 + 49956624 = 4016^2 + 7068^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×66084880² = 8734422729228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 412951 + ... + 413110.

Almost surely, 2^66084880 is an apocalyptic number.

It is an amenable number.

66084880 is an abundant number, since it is smaller than the sum of its proper divisors (87562652).

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

66084880 is a wasteful number, since it uses less digits than its factorization.

66084880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826074 (or 826068 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 66084880 is about 8129.2607289962. The cubic root of 66084880 is about 404.2971705014.

The spelling of 66084880 in words is "sixty-six million, eighty-four thousand, eight hundred eighty".