645538350 has 48 divisors (see below), whose sum is σ = 1602754560. Its totient is φ = 171948000.

The previous prime is 645538349. The next prime is 645538381. The reversal of 645538350 is 53835546.

It is a super-2 number, since 2×645538350² = 833439522641445000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645538299 and 645538308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170781 + ... + 174519.

It is an arithmetic number, because the mean of its divisors is an integer number (33390720).

Almost surely, 2^645538350 is an apocalyptic number.

645538350 is an abundant number, since it is smaller than the sum of its proper divisors (957216210).

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

645538350 is a wasteful number, since it uses less digits than its factorization.

645538350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905 (or 4900 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 39.

The square root of 645538350 is about 25407.4467430319. The cubic root of 645538350 is about 864.2525758693.

The spelling of 645538350 in words is "six hundred forty-five million, five hundred thirty-eight thousand, three hundred fifty".