85907819 has 4 divisors (see below), whose sum is σ = 85932960. Its totient is φ = 85882680.

The previous prime is 85907791. The next prime is 85907837. The reversal of 85907819 is 91870958.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 85907819 - 2¹⁶ = 85842283 is a prime.

It is a super-2 number, since 2×85907819² = 14760306730673522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85907879) 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, 6452 + ... + 14609.

It is an arithmetic number, because the mean of its divisors is an integer number (21483240).

Almost surely, 2^85907819 is an apocalyptic number.

85907819 is a deficient number, since it is larger than the sum of its proper divisors (25141).

85907819 is a wasteful number, since it uses less digits than its factorization.

85907819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25140.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 85907819 is about 9268.6470965292. The cubic root of 85907819 is about 441.2427315717.

The spelling of 85907819 in words is "eighty-five million, nine hundred seven thousand, eight hundred nineteen".