645063102 has 20 divisors (see below), whose sum is σ = 1445419536. Its totient is φ = 215020980.

The previous prime is 645063101. The next prime is 645063103. The reversal of 645063102 is 201360546.

645063102 is a `hidden beast` number, since 645 + 0 + 6 + 3 + 10 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (645063101) and next prime (645063103).

It is a super-2 number, since 2×645063102² = 832212811123724808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645063101) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 1990774 + ... + 1991097.

Almost surely, 2^645063102 is an apocalyptic number.

645063102 is an abundant number, since it is smaller than the sum of its proper divisors (800356434).

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

645063102 is a wasteful number, since it uses less digits than its factorization.

645063102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3981885 (or 3981876 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 645063102 is about 25398.0924874291. The cubic root of 645063102 is about 864.0404350289.

The spelling of 645063102 in words is "six hundred forty-five million, sixty-three thousand, one hundred two".