61278855 has 16 divisors (see below), whose sum is σ = 106959744. Its totient is φ = 29710880.

The previous prime is 61278809. The next prime is 61278869. The reversal of 61278855 is 55887216.

61278855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61278855 - 2¹⁶ = 61213319 is a prime.

It is a super-2 number, since 2×61278855² = 7510196140222050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 185529 + ... + 185858.

It is an arithmetic number, because the mean of its divisors is an integer number (6684984).

Almost surely, 2^61278855 is an apocalyptic number.

61278855 is a deficient number, since it is larger than the sum of its proper divisors (45680889).

61278855 is a wasteful number, since it uses less digits than its factorization.

61278855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371406.

The product of its digits is 134400, while the sum is 42.

The square root of 61278855 is about 7828.0811825121. The cubic root of 61278855 is about 394.2486491660.

The spelling of 61278855 in words is "sixty-one million, two hundred seventy-eight thousand, eight hundred fifty-five".