285720655 has 8 divisors (see below), whose sum is σ = 374034384. Its totient is φ = 207796800.

The previous prime is 285720647. The next prime is 285720691. The reversal of 285720655 is 556027582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 285720655 - 2³ = 285720647 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 2597406 + ... + 2597515.

It is an arithmetic number, because the mean of its divisors is an integer number (46754298).

Almost surely, 2^285720655 is an apocalyptic number.

285720655 is a deficient number, since it is larger than the sum of its proper divisors (88313729).

285720655 is a wasteful number, since it uses less digits than its factorization.

285720655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194937.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 285720655 is about 16903.2734995326. The cubic root of 285720655 is about 658.6386501697.

The spelling of 285720655 in words is "two hundred eighty-five million, seven hundred twenty thousand, six hundred fifty-five".