645775510 has 8 divisors (see below), whose sum is σ = 1162395936. Its totient is φ = 258310200.

The previous prime is 645775499. The next prime is 645775511. The reversal of 645775510 is 15577546.

It is a happy number.

645775510 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645775511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32288766 + ... + 32288785.

It is an arithmetic number, because the mean of its divisors is an integer number (145299492).

Almost surely, 2^645775510 is an apocalyptic number.

645775510 is a deficient number, since it is larger than the sum of its proper divisors (516620426).

645775510 is a wasteful number, since it uses less digits than its factorization.

645775510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64577558.

The product of its (nonzero) digits is 147000, while the sum is 40.

The square root of 645775510 is about 25412.1134500852. The cubic root of 645775510 is about 864.3584002279.

The spelling of 645775510 in words is "six hundred forty-five million, seven hundred seventy-five thousand, five hundred ten".