61616550 has 48 divisors (see below), whose sum is σ = 155115072. Its totient is φ = 16183200.

The previous prime is 61616543. The next prime is 61616567. The reversal of 61616550 is 5561616.

61616550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 6985 + ... + 13115.

It is an arithmetic number, because the mean of its divisors is an integer number (3231564).

Almost surely, 2^61616550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61616550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77557536).

61616550 is an abundant number, since it is smaller than the sum of its proper divisors (93498522).

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

61616550 is a wasteful number, since it uses less digits than its factorization.

61616550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6213 (or 6208 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 61616550 is about 7849.6210099597. The cubic root of 61616550 is about 394.9715302880.

The spelling of 61616550 in words is "sixty-one million, six hundred sixteen thousand, five hundred fifty".