61128705 has 16 divisors (see below), whose sum is σ = 106697664. Its totient is φ = 29638080.

The previous prime is 61128703. The next prime is 61128707. The reversal of 61128705 is 50782116.

It is an interprime number because it is at equal distance from previous prime (61128703) and next prime (61128707).

It is not a de Polignac number, because 61128705 - 2¹ = 61128703 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61128703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185074 + ... + 185403.

It is an arithmetic number, because the mean of its divisors is an integer number (6668604).

It is a Proth number, since it is equal to 3731 ⋅ 2¹⁴ + 1 and 3731 < 2¹⁴.

Almost surely, 2^61128705 is an apocalyptic number.

It is an amenable number.

61128705 is a deficient number, since it is larger than the sum of its proper divisors (45568959).

61128705 is a wasteful number, since it uses less digits than its factorization.

61128705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370496.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 61128705 is about 7818.4848276376. The cubic root of 61128705 is about 393.9263800366.

The spelling of 61128705 in words is "sixty-one million, one hundred twenty-eight thousand, seven hundred five".