85777942 has 4 divisors (see below), whose sum is σ = 128666916. Its totient is φ = 42888970.

The previous prime is 85777921. The next prime is 85777943. The reversal of 85777942 is 24977758.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85777943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21444484 + ... + 21444487.

It is an arithmetic number, because the mean of its divisors is an integer number (32166729).

Almost surely, 2^85777942 is an apocalyptic number.

85777942 is a deficient number, since it is larger than the sum of its proper divisors (42888974).

85777942 is a wasteful number, since it uses less digits than its factorization.

85777942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42888973.

The product of its digits is 987840, while the sum is 49.

The square root of 85777942 is about 9261.6381920263. The cubic root of 85777942 is about 441.0202598316.

The spelling of 85777942 in words is "eighty-five million, seven hundred seventy-seven thousand, nine hundred forty-two".