61679865 has 32 divisors (see below), whose sum is σ = 107888256. Its totient is φ = 29905920.

The previous prime is 61679861. The next prime is 61679869. The reversal of 61679865 is 56897616.

It is an interprime number because it is at equal distance from previous prime (61679861) and next prime (61679869).

It is not a de Polignac number, because 61679865 - 2² = 61679861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61679861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10705 + ... + 15425.

It is an arithmetic number, because the mean of its divisors is an integer number (3371508).

Almost surely, 2^61679865 is an apocalyptic number.

61679865 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61679865 is a deficient number, since it is larger than the sum of its proper divisors (46208391).

61679865 is a wasteful number, since it uses less digits than its factorization.

61679865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4809.

The product of its digits is 544320, while the sum is 48.

The square root of 61679865 is about 7853.6529717069. The cubic root of 61679865 is about 395.1067702610.

The spelling of 61679865 in words is "sixty-one million, six hundred seventy-nine thousand, eight hundred sixty-five".