646151790 has 16 divisors (see below), whose sum is σ = 1550764368. Its totient is φ = 172307136.

The previous prime is 646151789. The next prime is 646151797. The reversal of 646151790 is 97151646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646151797) 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, 10769167 + ... + 10769226.

It is an arithmetic number, because the mean of its divisors is an integer number (96922773).

Almost surely, 2^646151790 is an apocalyptic number.

646151790 is an abundant number, since it is smaller than the sum of its proper divisors (904612578).

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

646151790 is a wasteful number, since it uses less digits than its factorization.

646151790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21538403.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 646151790 is about 25419.5159277277. The cubic root of 646151790 is about 864.5262488709.

The spelling of 646151790 in words is "six hundred forty-six million, one hundred fifty-one thousand, seven hundred ninety".