61729923 has 4 divisors (see below), whose sum is σ = 82306568. Its totient is φ = 41153280.

The previous prime is 61729909. The next prime is 61729931. The reversal of 61729923 is 32992716.

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

It is not a de Polignac number, because 61729923 - 2⁶ = 61729859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61729963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10288318 + ... + 10288323.

It is an arithmetic number, because the mean of its divisors is an integer number (20576642).

Almost surely, 2^61729923 is an apocalyptic number.

61729923 is a deficient number, since it is larger than the sum of its proper divisors (20576645).

61729923 is a wasteful number, since it uses less digits than its factorization.

61729923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20576644.

The product of its digits is 40824, while the sum is 39.

The square root of 61729923 is about 7856.8392499783. The cubic root of 61729923 is about 395.2136279667.

The spelling of 61729923 in words is "sixty-one million, seven hundred twenty-nine thousand, nine hundred twenty-three".