845651898 has 144 divisors (see below), whose sum is σ = 2316970656. Its totient is φ = 220933440.

The previous prime is 845651857. The next prime is 845651899. The reversal of 845651898 is 898156548.

It is a happy number.

845651898 is a `hidden beast` number, since 8 + 456 + 5 + 189 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (845651899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1501765 + ... + 1502327.

It is an arithmetic number, because the mean of its divisors is an integer number (16090074).

Almost surely, 2^845651898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 845651898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158485328).

845651898 is an abundant number, since it is smaller than the sum of its proper divisors (1471318758).

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

845651898 is a wasteful number, since it uses less digits than its factorization.

845651898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 719 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 54.

The square root of 845651898 is about 29080.0945321710. The cubic root of 845651898 is about 945.6502520491.

The spelling of 845651898 in words is "eight hundred forty-five million, six hundred fifty-one thousand, eight hundred ninety-eight".