85139280 has 60 divisors (see below), whose sum is σ = 285928500. Its totient is φ = 22703616.

The previous prime is 85139239. The next prime is 85139293. The reversal of 85139280 is 8293158.

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 61402896 = 4872^2 + 7836^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58405 + ... + 59844.

It is an arithmetic number, because the mean of its divisors is an integer number (4765475).

Almost surely, 2^85139280 is an apocalyptic number.

85139280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

85139280 is an abundant number, since it is smaller than the sum of its proper divisors (200789220).

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

85139280 is a wasteful number, since it uses less digits than its factorization.

85139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118268 (or 118259 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 85139280 is about 9227.0948840900. The cubic root of 85139280 is about 439.9229892769.

The spelling of 85139280 in words is "eighty-five million, one hundred thirty-nine thousand, two hundred eighty".