85720919 has 4 divisors (see below), whose sum is σ = 90763344. Its totient is φ = 80678496.

The previous prime is 85720891. The next prime is 85720963. The reversal of 85720919 is 91902758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91902758 = 2 ⋅45951379.

It is a cyclic number.

It is not a de Polignac number, because 85720919 - 2¹² = 85716823 is a prime.

It is a super-2 number, since 2×85720919² = 14696151908409122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85720969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521187 + ... + 2521220.

It is an arithmetic number, because the mean of its divisors is an integer number (22690836).

Almost surely, 2^85720919 is an apocalyptic number.

85720919 is a deficient number, since it is larger than the sum of its proper divisors (5042425).

85720919 is a wasteful number, since it uses less digits than its factorization.

85720919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5042424.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 85720919 is about 9258.5592291674. The cubic root of 85720919 is about 440.9225118077.

The spelling of 85720919 in words is "eighty-five million, seven hundred twenty thousand, nine hundred nineteen".