61715689 has 8 divisors (see below), whose sum is σ = 70611840. Its totient is φ = 52839456.

The previous prime is 61715681. The next prime is 61715737. The reversal of 61715689 is 98651716.

It is a happy number.

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 61715689 - 2³ = 61715681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61715681) 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, 2397 + ... + 11365.

It is an arithmetic number, because the mean of its divisors is an integer number (8826480).

Almost surely, 2^61715689 is an apocalyptic number.

It is an amenable number.

61715689 is a deficient number, since it is larger than the sum of its proper divisors (8896151).

61715689 is an equidigital number, since it uses as much as digits as its factorization.

61715689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9959.

The product of its digits is 90720, while the sum is 43.

The square root of 61715689 is about 7855.9333627520. The cubic root of 61715689 is about 395.1832488413.

The spelling of 61715689 in words is "sixty-one million, seven hundred fifteen thousand, six hundred eighty-nine".