646326785 has 32 divisors (see below), whose sum is σ = 856977408. Its totient is φ = 465004800.

The previous prime is 646326773. The next prime is 646326797. The reversal of 646326785 is 587623646.

It is an interprime number because it is at equal distance from previous prime (646326773) and next prime (646326797).

It is not a de Polignac number, because 646326785 - 2⁶ = 646326721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 560960 + ... + 562110.

It is an arithmetic number, because the mean of its divisors is an integer number (26780544).

Almost surely, 2^646326785 is an apocalyptic number.

646326785 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

646326785 is a deficient number, since it is larger than the sum of its proper divisors (210650623).

646326785 is a wasteful number, since it uses less digits than its factorization.

646326785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1385.

The product of its digits is 1451520, while the sum is 47.

The square root of 646326785 is about 25422.9578334229. The cubic root of 646326785 is about 864.6042873533.

It can be divided in two parts, 64632 and 6785, that added together give a palindrome (71417).

The spelling of 646326785 in words is "six hundred forty-six million, three hundred twenty-six thousand, seven hundred eighty-five".