645126030 has 96 divisors (see below), whose sum is σ = 1783360800. Its totient is φ = 161803008.

The previous prime is 645126007. The next prime is 645126037. The reversal of 645126030 is 30621546.

645126030 is a `hidden beast` number, since 6 + 4 + 51 + 2 + 603 + 0 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 645125985 and 645126003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645126037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 441441 + ... + 442899.

It is an arithmetic number, because the mean of its divisors is an integer number (18576675).

Almost surely, 2^645126030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645126030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891680400).

645126030 is an abundant number, since it is smaller than the sum of its proper divisors (1138234770).

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

645126030 is a wasteful number, since it uses less digits than its factorization.

645126030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1486 counting only the distinct ones).

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

The square root of 645126030 is about 25399.3312904100. The cubic root of 645126030 is about 864.0685307653.

Adding to 645126030 its reverse (30621546), we get a palindrome (675747576).

The spelling of 645126030 in words is "six hundred forty-five million, one hundred twenty-six thousand, thirty".