61244778 has 64 divisors (see below), whose sum is σ = 153059328. Its totient is φ = 15932160.

The previous prime is 61244719. The next prime is 61244831. The reversal of 61244778 is 87744216.

61244778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

61244778 is a nontrivial binomial coefficient, being equal to C(11068, 2).

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, 20751 + ... + 23517.

It is an arithmetic number, because the mean of its divisors is an integer number (2391552).

Almost surely, 2^61244778 is an apocalyptic number.

61244778 is the 11067-th triangular number and also the 5534-th hexagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61244778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76529664).

61244778 is an abundant number, since it is smaller than the sum of its proper divisors (91814550).

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

61244778 is a wasteful number, since it uses less digits than its factorization.

61244778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2827.

The product of its digits is 75264, while the sum is 39.

The square root of 61244778 is about 7825.9042927958. The cubic root of 61244778 is about 394.1755554246.

The spelling of 61244778 in words is "sixty-one million, two hundred forty-four thousand, seven hundred seventy-eight".