61555488 has 24 divisors (see below), whose sum is σ = 161583408. Its totient is φ = 20518464.

The previous prime is 61555471. The next prime is 61555493. The reversal of 61555488 is 88455516.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 320506 + ... + 320697.

It is an arithmetic number, because the mean of its divisors is an integer number (6732642).

Almost surely, 2^61555488 is an apocalyptic number.

It is an amenable number.

61555488 is an abundant number, since it is smaller than the sum of its proper divisors (100027920).

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

61555488 is a wasteful number, since it uses less digits than its factorization.

61555488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641216 (or 641208 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The square root of 61555488 is about 7845.7305587179. The cubic root of 61555488 is about 394.8410149050.

The spelling of 61555488 in words is "sixty-one million, five hundred fifty-five thousand, four hundred eighty-eight".