85978740 has 24 divisors (see below), whose sum is σ = 240740640. Its totient is φ = 22927648.

The previous prime is 85978733. The next prime is 85978757. The reversal of 85978740 is 4787958.

It is a self number, because there is not a number n which added to its sum of digits gives 85978740.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 716430 + ... + 716549.

It is an arithmetic number, because the mean of its divisors is an integer number (10030860).

Almost surely, 2^85978740 is an apocalyptic number.

It is an amenable number.

85978740 is an abundant number, since it is smaller than the sum of its proper divisors (154761900).

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

85978740 is a wasteful number, since it uses less digits than its factorization.

85978740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432991 (or 1432989 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 48.

The square root of 85978740 is about 9272.4721622661. The cubic root of 85978740 is about 441.3641204770.

The spelling of 85978740 in words is "eighty-five million, nine hundred seventy-eight thousand, seven hundred forty".