85420819 has 16 divisors (see below), whose sum is σ = 94832640. Its totient is φ = 76296960.

The previous prime is 85420817. The next prime is 85420823. The reversal of 85420819 is 91802458.

It is a cyclic number.

It is not a de Polignac number, because 85420819 - 2¹ = 85420817 is a prime.

It is a super-2 number, since 2×85420819² = 14593432637261522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85420817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237762 + ... + 238120.

It is an arithmetic number, because the mean of its divisors is an integer number (5927040).

Almost surely, 2^85420819 is an apocalyptic number.

85420819 is a deficient number, since it is larger than the sum of its proper divisors (9411821).

85420819 is a wasteful number, since it uses less digits than its factorization.

85420819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 85420819 is about 9242.3383945839. The cubic root of 85420819 is about 440.4073689379.

The spelling of 85420819 in words is "eighty-five million, four hundred twenty thousand, eight hundred nineteen".