61128815 has 8 divisors (see below), whose sum is σ = 80023248. Its totient is φ = 44457280.

The previous prime is 61128803. The next prime is 61128817. The reversal of 61128815 is 51882116.

61128815 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61128815 - 2¹⁴ = 61112431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61128817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555662 + ... + 555771.

It is an arithmetic number, because the mean of its divisors is an integer number (10002906).

Almost surely, 2^61128815 is an apocalyptic number.

61128815 is a deficient number, since it is larger than the sum of its proper divisors (18894433).

61128815 is a wasteful number, since it uses less digits than its factorization.

61128815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111449.

The product of its digits is 3840, while the sum is 32.

The square root of 61128815 is about 7818.4918622456. The cubic root of 61128815 is about 393.9266163242.

The spelling of 61128815 in words is "sixty-one million, one hundred twenty-eight thousand, eight hundred fifteen".