64618989 has 16 divisors (see below), whose sum is σ = 94374720. Its totient is φ = 39146240.

The previous prime is 64618979. The next prime is 64619011. The reversal of 64618989 is 98981646.

It is a happy number.

It is not a de Polignac number, because 64618989 - 2⁷ = 64618861 is a prime.

It is a super-2 number, since 2×64618989² = 8351227478764242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64618949) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20367 + ... + 23324.

It is an arithmetic number, because the mean of its divisors is an integer number (5898420).

Almost surely, 2^64618989 is an apocalyptic number.

It is an amenable number.

64618989 is a deficient number, since it is larger than the sum of its proper divisors (29755731).

64618989 is a wasteful number, since it uses less digits than its factorization.

64618989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43740.

The product of its digits is 746496, while the sum is 51.

The square root of 64618989 is about 8038.5937202971. The cubic root of 64618989 is about 401.2854251970.

The spelling of 64618989 in words is "sixty-four million, six hundred eighteen thousand, nine hundred eighty-nine".