646753673 has 16 divisors (see below), whose sum is σ = 700744320. Its totient is φ = 594832896.

The previous prime is 646753643. The next prime is 646753703. The reversal of 646753673 is 376357646.

It is an interprime number because it is at equal distance from previous prime (646753643) and next prime (646753703).

It is a cyclic number.

It is not a de Polignac number, because 646753673 - 2¹⁸ = 646491529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646753633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472436 + ... + 473802.

It is an arithmetic number, because the mean of its divisors is an integer number (43796520).

Almost surely, 2^646753673 is an apocalyptic number.

It is an amenable number.

646753673 is a deficient number, since it is larger than the sum of its proper divisors (53990647).

646753673 is a wasteful number, since it uses less digits than its factorization.

646753673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096.

The product of its digits is 1905120, while the sum is 47.

The square root of 646753673 is about 25431.3521661747. The cubic root of 646753673 is about 864.7945976702.

It can be divided in two parts, 646753 and 673, that multiplied together give a square (435264769 = 20863²).

The spelling of 646753673 in words is "six hundred forty-six million, seven hundred fifty-three thousand, six hundred seventy-three".