65547989 has 8 divisors (see below), whose sum is σ = 70653240. Its totient is φ = 60451776.

The previous prime is 65547961. The next prime is 65547991. The reversal of 65547989 is 98974556.

It can be written as a sum of positive squares in 4 ways, for example, as 4972900 + 60575089 = 2230^2 + 7783^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65547989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65547989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65547949) 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, 25679 + ... + 28115.

It is an arithmetic number, because the mean of its divisors is an integer number (8831655).

Almost surely, 2^65547989 is an apocalyptic number.

It is an amenable number.

65547989 is a deficient number, since it is larger than the sum of its proper divisors (5105251).

65547989 is a wasteful number, since it uses less digits than its factorization.

65547989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519.

The product of its digits is 2721600, while the sum is 53.

The square root of 65547989 is about 8096.1712555998. The cubic root of 65547989 is about 403.1993197431.

The spelling of 65547989 in words is "sixty-five million, five hundred forty-seven thousand, nine hundred eighty-nine".