61144728 has 32 divisors (see below), whose sum is σ = 153106800. Its totient is φ = 20348928.

The previous prime is 61144711. The next prime is 61144729. The reversal of 61144728 is 82744116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61144729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16800 + ... + 20112.

Almost surely, 2^61144728 is an apocalyptic number.

It is an amenable number.

61144728 is an abundant number, since it is smaller than the sum of its proper divisors (91962072).

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

61144728 is a wasteful number, since it uses less digits than its factorization.

61144728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4091 (or 4087 counting only the distinct ones).

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

The square root of 61144728 is about 7819.5094475293. The cubic root of 61144728 is about 393.9607955701.

The spelling of 61144728 in words is "sixty-one million, one hundred forty-four thousand, seven hundred twenty-eight".