61043720 has 16 divisors (see below), whose sum is σ = 137348460. Its totient is φ = 24417472.

The previous prime is 61043699. The next prime is 61043779. The reversal of 61043720 is 2734016.

It can be written as a sum of positive squares in 2 ways, for example, as 57486724 + 3556996 = 7582^2 + 1886^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763007 + ... + 763086.

Almost surely, 2^61043720 is an apocalyptic number.

It is an amenable number.

61043720 is an abundant number, since it is smaller than the sum of its proper divisors (76304740).

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

61043720 is a wasteful number, since it uses less digits than its factorization.

61043720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526104 (or 1526100 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 61043720 is about 7813.0480607763. The cubic root of 61043720 is about 393.7437415651.

Adding to 61043720 its reverse (2734016), we get a palindrome (63777736).

The spelling of 61043720 in words is "sixty-one million, forty-three thousand, seven hundred twenty".