851245644 has 12 divisors (see below), whose sum is σ = 1986239864. Its totient is φ = 283748544.

The previous prime is 851245621. The next prime is 851245691. The reversal of 851245644 is 446542158.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 35468557 + ... + 35468580.

Almost surely, 2^851245644 is an apocalyptic number.

It is an amenable number.

851245644 is an abundant number, since it is smaller than the sum of its proper divisors (1134994220).

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

851245644 is a wasteful number, since it uses less digits than its factorization.

851245644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70937144 (or 70937142 counting only the distinct ones).

The product of its digits is 153600, while the sum is 39.

The square root of 851245644 is about 29176.1142717806. The cubic root of 851245644 is about 947.7307403503.

The spelling of 851245644 in words is "eight hundred fifty-one million, two hundred forty-five thousand, six hundred forty-four".