61779916 has 24 divisors (see below), whose sum is σ = 118198080. Its totient is φ = 28021200.

The previous prime is 61779911. The next prime is 61779917. The reversal of 61779916 is 61997716.

It is not an unprimeable number, because it can be changed into a prime (61779911) 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, 23895 + ... + 26353.

It is an arithmetic number, because the mean of its divisors is an integer number (4924920).

Almost surely, 2^61779916 is an apocalyptic number.

It is an amenable number.

61779916 is a deficient number, since it is larger than the sum of its proper divisors (56418164).

61779916 is a wasteful number, since it uses less digits than its factorization.

61779916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3043 counting only the distinct ones).

The product of its digits is 142884, while the sum is 46.

The square root of 61779916 is about 7860.0201017555. The cubic root of 61779916 is about 395.3202892777.

It can be divided in two parts, 61 and 779916, that added together give a palindrome (779977).

The spelling of 61779916 in words is "sixty-one million, seven hundred seventy-nine thousand, nine hundred sixteen".