61555144 has 16 divisors (see below), whose sum is σ = 131904000. Its totient is φ = 26380752.

The previous prime is 61555127. The next prime is 61555163. The reversal of 61555144 is 44155516.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 549544 + ... + 549655.

It is an arithmetic number, because the mean of its divisors is an integer number (8244000).

Almost surely, 2^61555144 is an apocalyptic number.

It is an amenable number.

61555144 is an abundant number, since it is smaller than the sum of its proper divisors (70348856).

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

61555144 is a wasteful number, since it uses less digits than its factorization.

61555144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099212 (or 1099208 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 61555144 is about 7845.7086359360. The cubic root of 61555144 is about 394.8402793867.

The spelling of 61555144 in words is "sixty-one million, five hundred fifty-five thousand, one hundred forty-four".