61778562 has 8 divisors (see below), whose sum is σ = 123557136. Its totient is φ = 20592852.

The previous prime is 61778537. The next prime is 61778597. The reversal of 61778562 is 26587716.

61778562 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

61778562 is an admirable number.

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 3 ways as a sum of consecutive naturals, for example, 5148208 + ... + 5148219.

It is an arithmetic number, because the mean of its divisors is an integer number (15444642).

Almost surely, 2^61778562 is an apocalyptic number.

61778562 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

61778562 is a wasteful number, since it uses less digits than its factorization.

61778562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10296432.

The product of its digits is 141120, while the sum is 42.

The square root of 61778562 is about 7859.9339691883. The cubic root of 61778562 is about 395.3174012432.

The spelling of 61778562 in words is "sixty-one million, seven hundred seventy-eight thousand, five hundred sixty-two".