52661778 has 16 divisors (see below), whose sum is σ = 113425536. Its totient is φ = 16203600.

The previous prime is 52661773. The next prime is 52661779. The reversal of 52661778 is 87716625.

It is not an unprimeable number, because it can be changed into a prime (52661771) 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 in 7 ways as a sum of consecutive naturals, for example, 337498 + ... + 337653.

It is an arithmetic number, because the mean of its divisors is an integer number (7089096).

Almost surely, 2^52661778 is an apocalyptic number.

52661778 is an abundant number, since it is smaller than the sum of its proper divisors (60763758).

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

52661778 is a wasteful number, since it uses less digits than its factorization.

52661778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675169.

The product of its digits is 141120, while the sum is 42.

The square root of 52661778 is about 7256.8435286976. The cubic root of 52661778 is about 374.8278391961.

The spelling of 52661778 in words is "fifty-two million, six hundred sixty-one thousand, seven hundred seventy-eight".