851601280 has 128 divisors (see below), whose sum is σ = 2181168000. Its totient is φ = 316975104.

The previous prime is 851601259. The next prime is 851601329. The reversal of 851601280 is 82106158.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716847 + ... + 718033.

It is an arithmetic number, because the mean of its divisors is an integer number (17040375).

Almost surely, 2^851601280 is an apocalyptic number.

851601280 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 851601280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1090584000).

851601280 is an abundant number, since it is smaller than the sum of its proper divisors (1329566720).

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

851601280 is a wasteful number, since it uses less digits than its factorization.

851601280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284 (or 1272 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 851601280 is about 29182.2082783329. The cubic root of 851601280 is about 947.8627039205.

The spelling of 851601280 in words is "eight hundred fifty-one million, six hundred one thousand, two hundred eighty".