61551504 has 120 divisors (see below), whose sum is σ = 198469440. Its totient is φ = 17443584.

The previous prime is 61551499. The next prime is 61551517. The reversal of 61551504 is 40515516.

It is a happy number.

61551504 is a `hidden beast` number, since 6 + 155 + 1 + 504 = 666.

61551504 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 228682 + ... + 228950.

It is an arithmetic number, because the mean of its divisors is an integer number (1653912).

Almost surely, 2^61551504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61551504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99234720).

61551504 is an abundant number, since it is smaller than the sum of its proper divisors (136917936).

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

61551504 is a wasteful number, since it uses less digits than its factorization.

61551504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 508 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 61551504 is about 7845.4766585594. The cubic root of 61551504 is about 394.8324964089.

The spelling of 61551504 in words is "sixty-one million, five hundred fifty-one thousand, five hundred four".