85830781 has 4 divisors (see below), whose sum is σ = 87285600. Its totient is φ = 84375964.

The previous prime is 85830769. The next prime is 85830793. The reversal of 85830781 is 18703858.

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 an interprime number because it is at equal distance from previous prime (85830769) and next prime (85830793).

It is a cyclic number.

It is not a de Polignac number, because 85830781 - 2⁷ = 85830653 is a prime.

It is a super-2 number, since 2×85830781² = 14733845934139922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85830761) 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, 727321 + ... + 727438.

It is an arithmetic number, because the mean of its divisors is an integer number (21821400).

Almost surely, 2^85830781 is an apocalyptic number.

It is an amenable number.

85830781 is a deficient number, since it is larger than the sum of its proper divisors (1454819).

85830781 is a wasteful number, since it uses less digits than its factorization.

85830781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1454818.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 85830781 is about 9264.4903259704. The cubic root of 85830781 is about 441.1107970402.

The spelling of 85830781 in words is "eighty-five million, eight hundred thirty thousand, seven hundred eighty-one".