64155989 has 8 divisors (see below), whose sum is σ = 67667040. Its totient is φ = 60658416.

The previous prime is 64155937. The next prime is 64155991. The reversal of 64155989 is 98955146.

It is a happy number.

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 64155989 - 2⁸ = 64155733 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 (64155389) 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, 7307 + ... + 13479.

It is an arithmetic number, because the mean of its divisors is an integer number (8458380).

Almost surely, 2^64155989 is an apocalyptic number.

It is an amenable number.

64155989 is a deficient number, since it is larger than the sum of its proper divisors (3511051).

64155989 is a wasteful number, since it uses less digits than its factorization.

64155989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6739.

The product of its digits is 388800, while the sum is 47.

The square root of 64155989 is about 8009.7433791602. The cubic root of 64155989 is about 400.3247134150.

The spelling of 64155989 in words is "sixty-four million, one hundred fifty-five thousand, nine hundred eighty-nine".