64890661 has 8 divisors (see below), whose sum is σ = 73231200. Its totient is φ = 56957040.

The previous prime is 64890647. The next prime is 64890667. The reversal of 64890661 is 16609846.

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 64890661 - 2⁵ = 64890629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890667) 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, 101391 + ... + 102028.

It is an arithmetic number, because the mean of its divisors is an integer number (9153900).

Almost surely, 2^64890661 is an apocalyptic number.

It is an amenable number.

64890661 is a deficient number, since it is larger than the sum of its proper divisors (8340539).

64890661 is a wasteful number, since it uses less digits than its factorization.

64890661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203459.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 64890661 is about 8055.4739773647. The cubic root of 64890661 is about 401.8470020814.

The spelling of 64890661 in words is "sixty-four million, eight hundred ninety thousand, six hundred sixty-one".