285680493 has 32 divisors (see below), whose sum is σ = 504729600. Its totient is φ = 156145968.

The previous prime is 285680489. The next prime is 285680509. The reversal of 285680493 is 394086582.

285680493 is a `hidden beast` number, since 2 + 85 + 6 + 80 + 493 = 666.

It is not a de Polignac number, because 285680493 - 2² = 285680489 is a prime.

It is a super-2 number, since 2×285680493² = 163226688161446098, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285680453) 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 31 ways as a sum of consecutive naturals, for example, 28513 + ... + 37206.

It is an arithmetic number, because the mean of its divisors is an integer number (15772800).

Almost surely, 2^285680493 is an apocalyptic number.

285680493 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

285680493 is a deficient number, since it is larger than the sum of its proper divisors (219049107).

285680493 is a wasteful number, since it uses less digits than its factorization.

285680493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65758 (or 65752 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 285680493 is about 16902.0854630427. The cubic root of 285680493 is about 658.6077884585.

The spelling of 285680493 in words is "two hundred eighty-five million, six hundred eighty thousand, four hundred ninety-three".