85729442 has 16 divisors (see below), whose sum is σ = 132437592. Its totient is φ = 41594880.

The previous prime is 85729439. The next prime is 85729471. The reversal of 85729442 is 24492758.

It can be written as a sum of positive squares in 4 ways, for example, as 20620681 + 65108761 = 4541^2 + 8069^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a self number, because there is not a number n which added to its sum of digits gives 85729442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13118 + ... + 18534.

Almost surely, 2^85729442 is an apocalyptic number.

85729442 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

85729442 is a deficient number, since it is larger than the sum of its proper divisors (46708150).

85729442 is a wasteful number, since it uses less digits than its factorization.

85729442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5653.

The product of its digits is 161280, while the sum is 41.

The square root of 85729442 is about 9259.0194945253. The cubic root of 85729442 is about 440.9371245692.

The spelling of 85729442 in words is "eighty-five million, seven hundred twenty-nine thousand, four hundred forty-two".