61789823 has 4 divisors (see below), whose sum is σ = 61811760. Its totient is φ = 61767888.

The previous prime is 61789801. The next prime is 61789867. The reversal of 61789823 is 32898716.

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

It is a cyclic number.

It is not a de Polignac number, because 61789823 - 2⁶ = 61789759 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 (61729823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5990 + ... + 12627.

It is an arithmetic number, because the mean of its divisors is an integer number (15452940).

Almost surely, 2^61789823 is an apocalyptic number.

61789823 is a deficient number, since it is larger than the sum of its proper divisors (21937).

61789823 is a wasteful number, since it uses less digits than its factorization.

61789823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21936.

The product of its digits is 145152, while the sum is 44.

The square root of 61789823 is about 7860.6502911655. The cubic root of 61789823 is about 395.3414192772.

The spelling of 61789823 in words is "sixty-one million, seven hundred eighty-nine thousand, eight hundred twenty-three".