61278945 has 32 divisors (see below), whose sum is σ = 120675072. Its totient is φ = 25857792.

The previous prime is 61278911. The next prime is 61278947. The reversal of 61278945 is 54987216.

61278945 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 61278945 - 2⁶ = 61278881 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61278897 and 61278906.

It is not an unprimeable number, because it can be changed into a prime (61278947) 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 31 ways as a sum of consecutive naturals, for example, 21082 + ... + 23811.

It is an arithmetic number, because the mean of its divisors is an integer number (3771096).

Almost surely, 2^61278945 is an apocalyptic number.

61278945 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

61278945 is a deficient number, since it is larger than the sum of its proper divisors (59396127).

61278945 is a wasteful number, since it uses less digits than its factorization.

61278945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44921.

The product of its digits is 120960, while the sum is 42.

The square root of 61278945 is about 7828.0869310452. The cubic root of 61278945 is about 394.2488421764.

The spelling of 61278945 in words is "sixty-one million, two hundred seventy-eight thousand, nine hundred forty-five".