61787689 has 4 divisors (see below), whose sum is σ = 63224656. Its totient is φ = 60350724.

The previous prime is 61787653. The next prime is 61787701. The reversal of 61787689 is 98678716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61787689 - 2¹¹ = 61785641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61787629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718419 + ... + 718504.

It is an arithmetic number, because the mean of its divisors is an integer number (15806164).

Almost surely, 2^61787689 is an apocalyptic number.

It is an amenable number.

61787689 is a deficient number, since it is larger than the sum of its proper divisors (1436967).

61787689 is a wasteful number, since it uses less digits than its factorization.

61787689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436966.

The product of its digits is 1016064, while the sum is 52.

The square root of 61787689 is about 7860.5145505876. The cubic root of 61787689 is about 395.3368679975.

The spelling of 61787689 in words is "sixty-one million, seven hundred eighty-seven thousand, six hundred eighty-nine".