646437894 has 8 divisors (see below), whose sum is σ = 1292875800. Its totient is φ = 215479296.

The previous prime is 646437853. The next prime is 646437899. The reversal of 646437894 is 498734646.

It is a sphenic number, since it is the product of 3 distinct primes.

646437894 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646437899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53869819 + ... + 53869830.

It is an arithmetic number, because the mean of its divisors is an integer number (161609475).

Almost surely, 2^646437894 is an apocalyptic number.

646437894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

646437894 is a wasteful number, since it uses less digits than its factorization.

646437894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107739654.

The product of its digits is 3483648, while the sum is 51.

The square root of 646437894 is about 25425.1429494506. The cubic root of 646437894 is about 864.6538287596.

The spelling of 646437894 in words is "six hundred forty-six million, four hundred thirty-seven thousand, eight hundred ninety-four".