61729723 has 24 divisors (see below), whose sum is σ = 72662688. Its totient is φ = 52272000.

The previous prime is 61729721. The next prime is 61729729. The reversal of 61729723 is 32792716.

It is not a de Polignac number, because 61729723 - 2¹ = 61729721 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 (61729721) 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 23 ways as a sum of consecutive naturals, for example, 113833 + ... + 114373.

It is an arithmetic number, because the mean of its divisors is an integer number (3027612).

Almost surely, 2^61729723 is an apocalyptic number.

61729723 is a deficient number, since it is larger than the sum of its proper divisors (10932965).

61729723 is a wasteful number, since it uses less digits than its factorization.

61729723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 616 counting only the distinct ones).

The product of its digits is 31752, while the sum is 37.

The square root of 61729723 is about 7856.8265222035. The cubic root of 61729723 is about 395.2132011461.

The spelling of 61729723 in words is "sixty-one million, seven hundred twenty-nine thousand, seven hundred twenty-three".