645241620 has 48 divisors (see below), whose sum is σ = 1808513280. Its totient is φ = 171889536.

The previous prime is 645241603. The next prime is 645241633. The reversal of 645241620 is 26142546.

645241620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60661 + ... + 70499.

It is an arithmetic number, because the mean of its divisors is an integer number (37677360).

Almost surely, 2^645241620 is an apocalyptic number.

645241620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645241620 is an abundant number, since it is smaller than the sum of its proper divisors (1163271660).

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

645241620 is a wasteful number, since it uses less digits than its factorization.

645241620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10944 (or 10942 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 645241620 is about 25401.6066421004. The cubic root of 645241620 is about 864.1201339726.

The spelling of 645241620 in words is "six hundred forty-five million, two hundred forty-one thousand, six hundred twenty".