645423030 has 48 divisors (see below), whose sum is σ = 1917830304. Its totient is φ = 147525120.

The previous prime is 645423001. The next prime is 645423061. The reversal of 645423030 is 30324546.

645423030 is a `hidden beast` number, since 64 + 542 + 30 + 30 = 666.

It is a super-3 number, since 3×645423030³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645422985 and 645423003.

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, 511611 + ... + 512870.

It is an arithmetic number, because the mean of its divisors is an integer number (39954798).

Almost surely, 2^645423030 is an apocalyptic number.

645423030 is an abundant number, since it is smaller than the sum of its proper divisors (1272407274).

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

645423030 is a wasteful number, since it uses less digits than its factorization.

645423030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024501 (or 1024498 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 645423030 is about 25405.1772282738. The cubic root of 645423030 is about 864.2011089851.

Adding to 645423030 its reverse (30324546), we get a palindrome (675747576).

The spelling of 645423030 in words is "six hundred forty-five million, four hundred twenty-three thousand, thirty".