851902640 has 60 divisors (see below), whose sum is σ = 2104094496. Its totient is φ = 320707584.

The previous prime is 851902631. The next prime is 851902643. The reversal of 851902640 is 46209158.

It is a self number, because there is not a number n which added to its sum of digits gives 851902640.

It is not an unprimeable number, because it can be changed into a prime (851902643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4697 + ... + 41543.

Almost surely, 2^851902640 is an apocalyptic number.

851902640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 851902640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1052047248).

851902640 is an abundant number, since it is smaller than the sum of its proper divisors (1252191856).

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

851902640 is a wasteful number, since it uses less digits than its factorization.

851902640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36894 (or 36871 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 851902640 is about 29187.3712416860. The cubic root of 851902640 is about 947.9744988897.

The spelling of 851902640 in words is "eight hundred fifty-one million, nine hundred two thousand, six hundred forty".