61128755 has 4 divisors (see below), whose sum is σ = 73354512. Its totient is φ = 48903000.

The previous prime is 61128737. The next prime is 61128761. The reversal of 61128755 is 55782116.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 61128755 - 2¹² = 61124659 is a prime.

It is a Duffinian number.

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, 6112871 + ... + 6112880.

It is an arithmetic number, because the mean of its divisors is an integer number (18338628).

Almost surely, 2^61128755 is an apocalyptic number.

61128755 is a deficient number, since it is larger than the sum of its proper divisors (12225757).

61128755 is a wasteful number, since it uses less digits than its factorization.

61128755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12225756.

The product of its digits is 16800, while the sum is 35.

The square root of 61128755 is about 7818.4880251875. The cubic root of 61128755 is about 393.9264874401.

The spelling of 61128755 in words is "sixty-one million, one hundred twenty-eight thousand, seven hundred fifty-five".