61145240 has 64 divisors (see below), whose sum is σ = 150746400. Its totient is φ = 22182912.

The previous prime is 61145233. The next prime is 61145251. The reversal of 61145240 is 4254116.

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, 29684 + ... + 31676.

Almost surely, 2^61145240 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 61145240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75373200).

61145240 is an abundant number, since it is smaller than the sum of its proper divisors (89601160).

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

61145240 is a wasteful number, since it uses less digits than its factorization.

61145240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076 (or 2072 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 61145240 is about 7819.5421860874. The cubic root of 61145240 is about 393.9618951872.

Adding to 61145240 its reverse (4254116), we get a palindrome (65399356).

The spelling of 61145240 in words is "sixty-one million, one hundred forty-five thousand, two hundred forty".