655891087 has 8 divisors (see below), whose sum is σ = 677911680. Its totient is φ = 633924480.

The previous prime is 655891081. The next prime is 655891097. The reversal of 655891087 is 780198556.

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

It is a cyclic number.

It is not a de Polignac number, because 655891087 - 2³ = 655891079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655891087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655891081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12003 + ... + 38155.

It is an arithmetic number, because the mean of its divisors is an integer number (84738960).

Almost surely, 2^655891087 is an apocalyptic number.

655891087 is a deficient number, since it is larger than the sum of its proper divisors (22020593).

655891087 is a wasteful number, since it uses less digits than its factorization.

655891087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26993.

The product of its (nonzero) digits is 604800, while the sum is 49.

The square root of 655891087 is about 25610.3706923582. The cubic root of 655891087 is about 868.8482080581.

The spelling of 655891087 in words is "six hundred fifty-five million, eight hundred ninety-one thousand, eighty-seven".