61788385 has 4 divisors (see below), whose sum is σ = 74146068. Its totient is φ = 49430704.

The previous prime is 61788379. The next prime is 61788401. The reversal of 61788385 is 58388716.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34152336 + 27636049 = 5844^2 + 5257^2 .

It is a cyclic number.

It is not a de Polignac number, because 61788385 - 2¹⁹ = 61264097 is a prime.

It is a Duffinian number.

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, 6178834 + ... + 6178843.

It is an arithmetic number, because the mean of its divisors is an integer number (18536517).

Almost surely, 2^61788385 is an apocalyptic number.

It is an amenable number.

61788385 is a deficient number, since it is larger than the sum of its proper divisors (12357683).

61788385 is a wasteful number, since it uses less digits than its factorization.

61788385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12357682.

The product of its digits is 322560, while the sum is 46.

The square root of 61788385 is about 7860.5588223739. The cubic root of 61788385 is about 395.3383524001.

It can be divided in two parts, 617 and 88385, that multiplied together give a palindrome (54533545).

The spelling of 61788385 in words is "sixty-one million, seven hundred eighty-eight thousand, three hundred eighty-five".