85640148 has 36 divisors (see below), whose sum is σ = 236160288. Its totient is φ = 25951440.

The previous prime is 85640143. The next prime is 85640171. The reversal of 85640148 is 84104658.

85640148 is a `hidden beast` number, since 8 + 5 + 640 + 1 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85640143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107736 + ... + 108527.

It is an arithmetic number, because the mean of its divisors is an integer number (6560008).

Almost surely, 2^85640148 is an apocalyptic number.

It is an amenable number.

85640148 is an abundant number, since it is smaller than the sum of its proper divisors (150520140).

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

85640148 is a wasteful number, since it uses less digits than its factorization.

85640148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216284 (or 216279 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 85640148 is about 9254.1962373833. The cubic root of 85640148 is about 440.7839810802.

The spelling of 85640148 in words is "eighty-five million, six hundred forty thousand, one hundred forty-eight".