61778893 has 8 divisors (see below), whose sum is σ = 67467456. Its totient is φ = 56102400.

The previous prime is 61778887. The next prime is 61778921. The reversal of 61778893 is 39887716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61778893 - 2¹³ = 61770701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61778293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10248 + ... + 15118.

It is an arithmetic number, because the mean of its divisors is an integer number (8433432).

Almost surely, 2^61778893 is an apocalyptic number.

It is an amenable number.

61778893 is a deficient number, since it is larger than the sum of its proper divisors (5688563).

61778893 is a wasteful number, since it uses less digits than its factorization.

61778893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6035.

The product of its digits is 508032, while the sum is 49.

The square root of 61778893 is about 7859.9550253166. The cubic root of 61778893 is about 395.3181072585.

The spelling of 61778893 in words is "sixty-one million, seven hundred seventy-eight thousand, eight hundred ninety-three".