645677076 has 48 divisors (see below), whose sum is σ = 1730050560. Its totient is φ = 185361120.

The previous prime is 645677041. The next prime is 645677089. The reversal of 645677076 is 670776546.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126216 + ... + 131231.

It is an arithmetic number, because the mean of its divisors is an integer number (36042720).

Almost surely, 2^645677076 is an apocalyptic number.

645677076 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

645677076 is an abundant number, since it is smaller than the sum of its proper divisors (1084373484).

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

645677076 is a wasteful number, since it uses less digits than its factorization.

645677076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257484 (or 257482 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 48.

The square root of 645677076 is about 25410.1766227628. The cubic root of 645677076 is about 864.3144806425.

The spelling of 645677076 in words is "six hundred forty-five million, six hundred seventy-seven thousand, seventy-six".