851397648 has 40 divisors (see below), whose sum is σ = 2200665696. Its totient is φ = 283641600.

The previous prime is 851397637. The next prime is 851397661. The reversal of 851397648 is 846793158.

It is a self number, because there is not a number n which added to its sum of digits gives 851397648.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110068 + ... + 117548.

Almost surely, 2^851397648 is an apocalyptic number.

It is an amenable number.

851397648 is an abundant number, since it is smaller than the sum of its proper divisors (1349268048).

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

851397648 is a wasteful number, since it uses less digits than its factorization.

851397648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9863 (or 9857 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 851397648 is about 29178.7190945730. The cubic root of 851397648 is about 947.7871479966.

The spelling of 851397648 in words is "eight hundred fifty-one million, three hundred ninety-seven thousand, six hundred forty-eight".