645424508 has 12 divisors (see below), whose sum is σ = 1129809072. Its totient is φ = 322621920.

The previous prime is 645424489. The next prime is 645424523. The reversal of 645424508 is 805424546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4985 + ... + 36272.

It is an arithmetic number, because the mean of its divisors is an integer number (94150756).

Almost surely, 2^645424508 is an apocalyptic number.

It is an amenable number.

645424508 is a deficient number, since it is larger than the sum of its proper divisors (484384564).

645424508 is a wasteful number, since it uses less digits than its factorization.

645424508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45172 (or 45170 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 38.

The square root of 645424508 is about 25405.2063168162. The cubic root of 645424508 is about 864.2017686498.

Adding to 645424508 its sum of digits (38), we get a palindrome (645424546).

The spelling of 645424508 in words is "six hundred forty-five million, four hundred twenty-four thousand, five hundred eight".