61774729 has 4 divisors (see below), whose sum is σ = 61795600. Its totient is φ = 61753860.

The previous prime is 61774693. The next prime is 61774747. The reversal of 61774729 is 92747716.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61774729 - 2⁹ = 61774217 is a prime.

It is a super-2 number, since 2×61774729² = 7632234286046882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61771729) 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, 5079 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (15448900).

Almost surely, 2^61774729 is an apocalyptic number.

It is an amenable number.

61774729 is a deficient number, since it is larger than the sum of its proper divisors (20871).

61774729 is a wasteful number, since it uses less digits than its factorization.

61774729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20870.

The product of its digits is 148176, while the sum is 43.

The square root of 61774729 is about 7859.6901338412. The cubic root of 61774729 is about 395.3092253599.

The spelling of 61774729 in words is "sixty-one million, seven hundred seventy-four thousand, seven hundred twenty-nine".