61697679 has 8 divisors (see below), whose sum is σ = 82555392. Its totient is φ = 40985880.

The previous prime is 61697663. The next prime is 61697717. The reversal of 61697679 is 97679616.

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

It is not a de Polignac number, because 61697679 - 2⁴ = 61697663 is a prime.

It is a super-3 number, since 3×61697679³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61697609) 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, 35487 + ... + 37184.

It is an arithmetic number, because the mean of its divisors is an integer number (10319424).

Almost surely, 2^61697679 is an apocalyptic number.

61697679 is a deficient number, since it is larger than the sum of its proper divisors (20857713).

61697679 is a wasteful number, since it uses less digits than its factorization.

61697679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72957.

The product of its digits is 857304, while the sum is 51.

The square root of 61697679 is about 7854.7870117528. The cubic root of 61697679 is about 395.1448040370.

The spelling of 61697679 in words is "sixty-one million, six hundred ninety-seven thousand, six hundred seventy-nine".