85703781 has 4 divisors (see below), whose sum is σ = 114271712. Its totient is φ = 57135852.

The previous prime is 85703777. The next prime is 85703789. The reversal of 85703781 is 18730758.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 85703781 - 2² = 85703777 is a prime.

It is a super-2 number, since 2×85703781² = 14690276155391922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85703789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14283961 + ... + 14283966.

It is an arithmetic number, because the mean of its divisors is an integer number (28567928).

Almost surely, 2^85703781 is an apocalyptic number.

It is an amenable number.

85703781 is a deficient number, since it is larger than the sum of its proper divisors (28567931).

85703781 is a wasteful number, since it uses less digits than its factorization.

85703781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28567930.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 85703781 is about 9257.6336609309. The cubic root of 85703781 is about 440.8931256176.

The spelling of 85703781 in words is "eighty-five million, seven hundred three thousand, seven hundred eighty-one".