645430830 has 64 divisors (see below), whose sum is σ = 1763347968. Its totient is φ = 149663360.

The previous prime is 645430811. The next prime is 645430847. The reversal of 645430830 is 38034546.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 645430791 and 645430800.

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 31 ways as a sum of consecutive naturals, for example, 34929 + ... + 50108.

It is an arithmetic number, because the mean of its divisors is an integer number (27552312).

Almost surely, 2^645430830 is an apocalyptic number.

645430830 is an abundant number, since it is smaller than the sum of its proper divisors (1117917138).

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

645430830 is a wasteful number, since it uses less digits than its factorization.

645430830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85081.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 645430830 is about 25405.3307398270. The cubic root of 645430830 is about 864.2045902892.

The spelling of 645430830 in words is "six hundred forty-five million, four hundred thirty thousand, eight hundred thirty".