64537989 has 8 divisors (see below), whose sum is σ = 86158752. Its totient is φ = 42971280.

The previous prime is 64537987. The next prime is 64538011. The reversal of 64537989 is 98973546.

64537989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 64537989 - 2¹ = 64537987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64537981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10639 + ... + 15564.

It is an arithmetic number, because the mean of its divisors is an integer number (10769844).

Almost surely, 2^64537989 is an apocalyptic number.

It is an amenable number.

64537989 is a deficient number, since it is larger than the sum of its proper divisors (21620763).

64537989 is a wasteful number, since it uses less digits than its factorization.

64537989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27027.

The product of its digits is 1632960, while the sum is 51.

The square root of 64537989 is about 8033.5539457951. The cubic root of 64537989 is about 401.1176844615.

The spelling of 64537989 in words is "sixty-four million, five hundred thirty-seven thousand, nine hundred eighty-nine".