61144280 has 64 divisors (see below), whose sum is σ = 148262400. Its totient is φ = 22619520.

The previous prime is 61144253. The next prime is 61144297. The reversal of 61144280 is 8244116.

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, 31745 + ... + 33615.

It is an arithmetic number, because the mean of its divisors is an integer number (2316600).

Almost surely, 2^61144280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61144280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74131200).

61144280 is an abundant number, since it is smaller than the sum of its proper divisors (87118120).

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

61144280 is a wasteful number, since it uses less digits than its factorization.

61144280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 61144280 is about 7819.4808011786. The cubic root of 61144280 is about 393.9598334001.

Adding to 61144280 its reverse (8244116), we get a palindrome (69388396).

The spelling of 61144280 in words is "sixty-one million, one hundred forty-four thousand, two hundred eighty".