61916778 has 64 divisors (see below), whose sum is σ = 171555840. Its totient is φ = 16081200.

The previous prime is 61916761. The next prime is 61916809. The reversal of 61916778 is 87761916.

61916778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3288 + ... + 11603.

It is an arithmetic number, because the mean of its divisors is an integer number (2680560).

Almost surely, 2^61916778 is an apocalyptic number.

61916778 is an abundant number, since it is smaller than the sum of its proper divisors (109639062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61916778 is a wasteful number, since it uses less digits than its factorization.

61916778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14920 (or 14914 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 61916778 is about 7868.7214971684. The cubic root of 61916778 is about 395.6119936876.

The spelling of 61916778 in words is "sixty-one million, nine hundred sixteen thousand, seven hundred seventy-eight".