61720733 has 2 divisors, whose sum is σ = 61720734. Its totient is φ = 61720732.

The previous prime is 61720723. The next prime is 61720739. The reversal of 61720733 is 33702716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35485849 + 26234884 = 5957^2 + 5122^2 .

It is a cyclic number.

It is not a de Polignac number, because 61720733 - 2⁶ = 61720669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61720696 and 61720705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61720739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30860366 + 30860367.

It is an arithmetic number, because the mean of its divisors is an integer number (30860367).

Almost surely, 2^61720733 is an apocalyptic number.

It is an amenable number.

61720733 is a deficient number, since it is larger than the sum of its proper divisors (1).

61720733 is an equidigital number, since it uses as much as digits as its factorization.

61720733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 29.

The square root of 61720733 is about 7856.2543874292. The cubic root of 61720733 is about 395.1940146073.

The spelling of 61720733 in words is "sixty-one million, seven hundred twenty thousand, seven hundred thirty-three".