61667789 has 8 divisors (see below), whose sum is σ = 67060728. Its totient is φ = 56471040.

The previous prime is 61667783. The next prime is 61667791. The reversal of 61667789 is 98776616.

It can be written as a sum of positive squares in 4 ways, for example, as 38962564 + 22705225 = 6242^2 + 4765^2 .

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 61667789 - 2²⁰ = 60619213 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 (61667783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48392 + ... + 49649.

It is an arithmetic number, because the mean of its divisors is an integer number (8382591).

Almost surely, 2^61667789 is an apocalyptic number.

It is an amenable number.

61667789 is a deficient number, since it is larger than the sum of its proper divisors (5392939).

61667789 is a wasteful number, since it uses less digits than its factorization.

61667789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98095.

The product of its digits is 762048, while the sum is 50.

The square root of 61667789 is about 7852.8841198632. The cubic root of 61667789 is about 395.0809832354.

The spelling of 61667789 in words is "sixty-one million, six hundred sixty-seven thousand, seven hundred eighty-nine".