646459498 has 4 divisors (see below), whose sum is σ = 969689250. Its totient is φ = 323229748.

The previous prime is 646459469. The next prime is 646459579. The reversal of 646459498 is 894954646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 894954646 = 2 ⋅447477323.

It can be written as a sum of positive squares in only one way, i.e., 639735849 + 6723649 = 25293^2 + 2593^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161614873 + ... + 161614876.

Almost surely, 2^646459498 is an apocalyptic number.

646459498 is a deficient number, since it is larger than the sum of its proper divisors (323229752).

646459498 is a wasteful number, since it uses less digits than its factorization.

646459498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323229751.

The product of its digits is 7464960, while the sum is 55.

The square root of 646459498 is about 25425.5678009361. The cubic root of 646459498 is about 864.6634609162.

The spelling of 646459498 in words is "six hundred forty-six million, four hundred fifty-nine thousand, four hundred ninety-eight".