85851720 has 48 divisors (see below), whose sum is σ = 279019260. Its totient is φ = 22893696.

The previous prime is 85851719. The next prime is 85851721. The reversal of 85851720 is 2715858.

85851720 is a `hidden beast` number, since 8 + 585 + 1 + 72 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (85851719) and next prime (85851721).

It can be written as a sum of positive squares in 2 ways, for example, as 81108036 + 4743684 = 9006^2 + 2178^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (85851721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118879 + ... + 119598.

Almost surely, 2^85851720 is an apocalyptic number.

It is an amenable number.

85851720 is an abundant number, since it is smaller than the sum of its proper divisors (193167540).

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

85851720 is a wasteful number, since it uses less digits than its factorization.

85851720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238494 (or 238487 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 85851720 is about 9265.6203246194. The cubic root of 85851720 is about 441.1466647785.

The spelling of 85851720 in words is "eighty-five million, eight hundred fifty-one thousand, seven hundred twenty".