645233100 has 36 divisors (see below), whose sum is σ = 1866875304. Its totient is φ = 172062080.

The previous prime is 645233089. The next prime is 645233111. The reversal of 645233100 is 1332546.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (645233089) and next prime (645233111).

It is a super-2 number, since 2×645233100² = 832651506671220000, which contains 22 as substring.

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 11 ways as a sum of consecutive naturals, for example, 1075089 + ... + 1075688.

Almost surely, 2^645233100 is an apocalyptic number.

645233100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645233100 is an abundant number, since it is smaller than the sum of its proper divisors (1221642204).

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

645233100 is a wasteful number, since it uses less digits than its factorization.

645233100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150794 (or 2150787 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 645233100 is about 25401.4389356194. The cubic root of 645233100 is about 864.1163305726.

Adding to 645233100 its reverse (1332546), we get a palindrome (646565646).

The spelling of 645233100 in words is "six hundred forty-five million, two hundred thirty-three thousand, one hundred".