645465530 has 16 divisors (see below), whose sum is σ = 1222987680. Its totient is φ = 244597392.

The previous prime is 645465529. The next prime is 645465553. The reversal of 645465530 is 35564546.

It is a happy number.

645465530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1698404 + ... + 1698783.

It is an arithmetic number, because the mean of its divisors is an integer number (76436730).

Almost surely, 2^645465530 is an apocalyptic number.

645465530 is a deficient number, since it is larger than the sum of its proper divisors (577522150).

645465530 is a wasteful number, since it uses less digits than its factorization.

645465530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397213.

The product of its (nonzero) digits is 216000, while the sum is 38.

The square root of 645465530 is about 25406.0136581873. The cubic root of 645465530 is about 864.2200772893.

The spelling of 645465530 in words is "six hundred forty-five million, four hundred sixty-five thousand, five hundred thirty".