61278618 has 8 divisors (see below), whose sum is σ = 122557248. Its totient is φ = 20426204.

The previous prime is 61278583. The next prime is 61278631. The reversal of 61278618 is 81687216.

61278618 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.

61278618 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 5106546 + ... + 5106557.

It is an arithmetic number, because the mean of its divisors is an integer number (15319656).

Almost surely, 2^61278618 is an apocalyptic number.

61278618 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61278618 is a wasteful number, since it uses less digits than its factorization.

61278618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10213108.

The product of its digits is 32256, while the sum is 39.

The square root of 61278618 is about 7828.0660446882. The cubic root of 61278618 is about 394.2481409045.

The spelling of 61278618 in words is "sixty-one million, two hundred seventy-eight thousand, six hundred eighteen".