61220144 has 10 divisors (see below), whose sum is σ = 118614060. Its totient is φ = 30610064.

The previous prime is 61220143. The next prime is 61220153. The reversal of 61220144 is 44102216.

It is not an unprimeable number, because it can be changed into a prime (61220143) by changing a digit.

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 as a sum of consecutive naturals, namely, 1913114 + ... + 1913145.

It is an arithmetic number, because the mean of its divisors is an integer number (11861406).

Almost surely, 2^61220144 is an apocalyptic number.

It is an amenable number.

61220144 is a deficient number, since it is larger than the sum of its proper divisors (57393916).

61220144 is a wasteful number, since it uses less digits than its factorization.

61220144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826267 (or 3826261 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 61220144 is about 7824.3302588784. The cubic root of 61220144 is about 394.1226996378.

The spelling of 61220144 in words is "sixty-one million, two hundred twenty thousand, one hundred forty-four".