85724077 has 4 divisors (see below), whose sum is σ = 85764636. Its totient is φ = 85683520.

The previous prime is 85724033. The next prime is 85724101. The reversal of 85724077 is 77042758.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60933636 + 24790441 = 7806^2 + 4979^2 .

It is a cyclic number.

It is not a de Polignac number, because 85724077 - 2²³ = 77335469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85724017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16924 + ... + 21397.

It is an arithmetic number, because the mean of its divisors is an integer number (21441159).

Almost surely, 2^85724077 is an apocalyptic number.

It is an amenable number.

85724077 is a deficient number, since it is larger than the sum of its proper divisors (40559).

85724077 is a wasteful number, since it uses less digits than its factorization.

85724077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40558.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 85724077 is about 9258.7297724904. The cubic root of 85724077 is about 440.9279263405.

The spelling of 85724077 in words is "eighty-five million, seven hundred twenty-four thousand, seventy-seven".