61144278 has 32 divisors (see below), whose sum is σ = 132560736. Its totient is φ = 18690048.

The previous prime is 61144253. The next prime is 61144297. The reversal of 61144278 is 87244116.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9750 + ... + 14742.

It is an arithmetic number, because the mean of its divisors is an integer number (4142523).

Almost surely, 2^61144278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61144278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66280368).

61144278 is an abundant number, since it is smaller than the sum of its proper divisors (71416458).

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

61144278 is a wasteful number, since it uses less digits than its factorization.

61144278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5168.

The product of its digits is 10752, while the sum is 33.

The square root of 61144278 is about 7819.4806732928. The cubic root of 61144278 is about 393.9598291047.

The spelling of 61144278 in words is "sixty-one million, one hundred forty-four thousand, two hundred seventy-eight".