645071030 has 16 divisors (see below), whose sum is σ = 1162080000. Its totient is φ = 257816832.

The previous prime is 645071029. The next prime is 645071039. The reversal of 645071030 is 30170546.

It is a super-2 number, since 2×645071030² = 832233267490521800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645071039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13334 + ... + 38313.

It is an arithmetic number, because the mean of its divisors is an integer number (72630000).

Almost surely, 2^645071030 is an apocalyptic number.

645071030 is a deficient number, since it is larger than the sum of its proper divisors (517008970).

645071030 is a wasteful number, since it uses less digits than its factorization.

645071030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52903.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 645071030 is about 25398.2485616627. The cubic root of 645071030 is about 864.0439747780.

The spelling of 645071030 in words is "six hundred forty-five million, seventy-one thousand, thirty".