61140730 has 24 divisors (see below), whose sum is σ = 128022228. Its totient is φ = 20962368.

The previous prime is 61140719. The next prime is 61140733. The reversal of 61140730 is 3704116.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 3969 = 7819^2 + 63^2 .

It is not an unprimeable number, because it can be changed into a prime (61140733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61899 + ... + 62878.

Almost surely, 2^61140730 is an apocalyptic number.

61140730 is an abundant number, since it is smaller than the sum of its proper divisors (66881498).

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

61140730 is a wasteful number, since it uses less digits than its factorization.

61140730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124798 (or 124791 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 61140730 is about 7819.2538007153. The cubic root of 61140730 is about 393.9522088958.

Adding to 61140730 its reverse (3704116), we get a palindrome (64844846).

The spelling of 61140730 in words is "sixty-one million, one hundred forty thousand, seven hundred thirty".