645260464 has 20 divisors (see below), whose sum is σ = 1283982304. Its totient is φ = 313910208.

The previous prime is 645260431. The next prime is 645260477. The reversal of 645260464 is 464062546.

645260464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×645260464² = 832722132802990592, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

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, 544392 + ... + 545575.

Almost surely, 2^645260464 is an apocalyptic number.

It is an amenable number.

645260464 is a deficient number, since it is larger than the sum of its proper divisors (638721840).

645260464 is a wasteful number, since it uses less digits than its factorization.

645260464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090012 (or 1090006 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

The square root of 645260464 is about 25401.9775608121. The cubic root of 645260464 is about 864.1285459746.

The spelling of 645260464 in words is "six hundred forty-five million, two hundred sixty thousand, four hundred sixty-four".