646706658 has 16 divisors (see below), whose sum is σ = 1392906816. Its totient is φ = 198986640.

The previous prime is 646706657. The next prime is 646706659. The reversal of 646706658 is 856607646.

It is an interprime number because it is at equal distance from previous prime (646706657) and next prime (646706659).

It is not an unprimeable number, because it can be changed into a prime (646706657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4145478 + ... + 4145633.

It is an arithmetic number, because the mean of its divisors is an integer number (87056676).

Almost surely, 2^646706658 is an apocalyptic number.

646706658 is an abundant number, since it is smaller than the sum of its proper divisors (746200158).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646706658 is a wasteful number, since it uses less digits than its factorization.

646706658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291129.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 646706658 is about 25430.4277982106. The cubic root of 646706658 is about 864.7736420859.

The spelling of 646706658 in words is "six hundred forty-six million, seven hundred six thousand, six hundred fifty-eight".