85720656 has 40 divisors (see below), whose sum is σ = 253081024. Its totient is φ = 24491520.

The previous prime is 85720639. The next prime is 85720667. The reversal of 85720656 is 65602758.

It is a happy number.

It is a nialpdrome in base 14.

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, 127225 + ... + 127896.

Almost surely, 2^85720656 is an apocalyptic number.

It is an amenable number.

85720656 is an abundant number, since it is smaller than the sum of its proper divisors (167360368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85720656 is a wasteful number, since it uses less digits than its factorization.

85720656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255139 (or 255133 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The square root of 85720656 is about 9258.5450260827. The cubic root of 85720656 is about 440.9220608764.

The spelling of 85720656 in words is "eighty-five million, seven hundred twenty thousand, six hundred fifty-six".