61768915 has 32 divisors (see below), whose sum is σ = 84510720. Its totient is φ = 42996096.

The previous prime is 61768913. The next prime is 61768979. The reversal of 61768915 is 51986716.

It is a happy number.

It is not a de Polignac number, because 61768915 - 2¹ = 61768913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61768913) 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, 117844 + ... + 118366.

It is an arithmetic number, because the mean of its divisors is an integer number (2640960).

Almost surely, 2^61768915 is an apocalyptic number.

61768915 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61768915 is a deficient number, since it is larger than the sum of its proper divisors (22741805).

61768915 is a wasteful number, since it uses less digits than its factorization.

61768915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643.

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

The square root of 61768915 is about 7859.3202632289. The cubic root of 61768915 is about 395.2968233093.

The spelling of 61768915 in words is "sixty-one million, seven hundred sixty-eight thousand, nine hundred fifteen".