645061444 has 12 divisors (see below), whose sum is σ = 1129109884. Its totient is φ = 322458624.

The previous prime is 645061433. The next prime is 645061451. The reversal of 645061444 is 444160546.

645061444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 325080900 + 319980544 = 18030^2 + 17888^2 .

It is a super-2 number, since 2×645061444² = 832208533070730272, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

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, 5524 + ... + 36340.

Almost surely, 2^645061444 is an apocalyptic number.

It is an amenable number.

645061444 is a deficient number, since it is larger than the sum of its proper divisors (484048440).

645061444 is a wasteful number, since it uses less digits than its factorization.

645061444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36054 (or 36052 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 645061444 is about 25398.0598471616. The cubic root of 645061444 is about 864.0396947498.

The spelling of 645061444 in words is "six hundred forty-five million, sixty-one thousand, four hundred forty-four".