645816802 has 8 divisors (see below), whose sum is σ = 1019710800. Its totient is φ = 305913204.

The previous prime is 645816799. The next prime is 645816803. The reversal of 645816802 is 208618546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (645816803) 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, 8497552 + ... + 8497627.

It is an arithmetic number, because the mean of its divisors is an integer number (127463850).

Almost surely, 2^645816802 is an apocalyptic number.

645816802 is a deficient number, since it is larger than the sum of its proper divisors (373893998).

645816802 is a wasteful number, since it uses less digits than its factorization.

645816802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16995200.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 645816802 is about 25412.9258842818. The cubic root of 645816802 is about 864.3768226910.

The spelling of 645816802 in words is "six hundred forty-five million, eight hundred sixteen thousand, eight hundred two".