645089349 has 16 divisors (see below), whose sum is σ = 944755200. Its totient is φ = 389709936.

The previous prime is 645089317. The next prime is 645089353. The reversal of 645089349 is 943980546.

It is not a de Polignac number, because 645089349 - 2⁵ = 645089317 is a prime.

It is a super-2 number, since 2×645089349² = 832280536386487602, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645089298 and 645089307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645089749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244719 + ... + 247340.

It is an arithmetic number, because the mean of its divisors is an integer number (59047200).

Almost surely, 2^645089349 is an apocalyptic number.

645089349 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

645089349 is a deficient number, since it is larger than the sum of its proper divisors (299665851).

645089349 is a wasteful number, since it uses less digits than its factorization.

645089349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492104.

The product of its (nonzero) digits is 933120, while the sum is 48.

The square root of 645089349 is about 25398.6091942059. The cubic root of 645089349 is about 864.0521538626.

The spelling of 645089349 in words is "six hundred forty-five million, eighty-nine thousand, three hundred forty-nine".