645880176 has 40 divisors (see below), whose sum is σ = 1853916560. Its totient is φ = 215293248.

The previous prime is 645880163. The next prime is 645880189. The reversal of 645880176 is 671088546.

It is a happy number.

645880176 is a `hidden beast` number, since 64 + 588 + 0 + 1 + 7 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (645880163) and next prime (645880189).

It is a super-2 number, since 2×645880176² = 834322403499581952, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 747115 + ... + 747978.

It is an arithmetic number, because the mean of its divisors is an integer number (46347914).

Almost surely, 2^645880176 is an apocalyptic number.

It is an amenable number.

645880176 is an abundant number, since it is smaller than the sum of its proper divisors (1208036384).

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

645880176 is a wasteful number, since it uses less digits than its factorization.

645880176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495110 (or 1495098 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 645880176 is about 25414.1727388479. The cubic root of 645880176 is about 864.4050955308.

The spelling of 645880176 in words is "six hundred forty-five million, eight hundred eighty thousand, one hundred seventy-six".