645336546 has 16 divisors (see below), whose sum is σ = 1291048608. Its totient is φ = 215049600.

The previous prime is 645336529. The next prime is 645336547. The reversal of 645336546 is 645633546.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 645336498 and 645336507.

It is not an unprimeable number, because it can be changed into a prime (645336547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9906 + ... + 37266.

It is an arithmetic number, because the mean of its divisors is an integer number (80690538).

Almost surely, 2^645336546 is an apocalyptic number.

645336546 is an abundant number, since it is smaller than the sum of its proper divisors (645712062).

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

645336546 is a wasteful number, since it uses less digits than its factorization.

645336546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31297.

The product of its digits is 777600, while the sum is 42.

The square root of 645336546 is about 25403.4750772409. The cubic root of 645336546 is about 864.1625074769.

The spelling of 645336546 in words is "six hundred forty-five million, three hundred thirty-six thousand, five hundred forty-six".