64890585 has 32 divisors (see below), whose sum is σ = 115920000. Its totient is φ = 34440768.

The previous prime is 64890583. The next prime is 64890587. The reversal of 64890585 is 58509846.

64890585 is a `hidden beast` number, since 64 + 8 + 9 + 0 + 585 = 666.

It is an interprime number because it is at equal distance from previous prime (64890583) and next prime (64890587).

It is not a de Polignac number, because 64890585 - 2¹ = 64890583 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64890585.

It is not an unprimeable number, because it can be changed into a prime (64890583) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29866 + ... + 31964.

It is an arithmetic number, because the mean of its divisors is an integer number (3622500).

Almost surely, 2^64890585 is an apocalyptic number.

It is an amenable number.

64890585 is a deficient number, since it is larger than the sum of its proper divisors (51029415).

64890585 is a wasteful number, since it uses less digits than its factorization.

64890585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2342 (or 2336 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 64890585 is about 8055.4692600742. The cubic root of 64890585 is about 401.8468452002.

The spelling of 64890585 in words is "sixty-four million, eight hundred ninety thousand, five hundred eighty-five".