851510640 has 40 divisors (see below), whose sum is σ = 2639683728. Its totient is φ = 227069440.

The previous prime is 851510549. The next prime is 851510657. The reversal of 851510640 is 46015158.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 851510598 and 851510607.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1773741 + ... + 1774220.

Almost surely, 2^851510640 is an apocalyptic number.

851510640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

851510640 is an abundant number, since it is smaller than the sum of its proper divisors (1788173088).

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

851510640 is a wasteful number, since it uses less digits than its factorization.

851510640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547977 (or 3547971 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 851510640 is about 29180.6552359607. The cubic root of 851510640 is about 947.8290742060.

Adding to 851510640 its reverse (46015158), we get a palindrome (897525798).

The spelling of 851510640 in words is "eight hundred fifty-one million, five hundred ten thousand, six hundred forty".