61724469 has 4 divisors (see below), whose sum is σ = 82299296. Its totient is φ = 41149644.

The previous prime is 61724459. The next prime is 61724491. The reversal of 61724469 is 96442716.

It is a happy number.

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 not a de Polignac number, because 61724469 - 2⁸ = 61724213 is a prime.

It is a super-2 number, since 2×61724469² = 7619820146663922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61724459) 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 3 ways as a sum of consecutive naturals, for example, 10287409 + ... + 10287414.

It is an arithmetic number, because the mean of its divisors is an integer number (20574824).

Almost surely, 2^61724469 is an apocalyptic number.

It is an amenable number.

61724469 is a deficient number, since it is larger than the sum of its proper divisors (20574827).

61724469 is a wasteful number, since it uses less digits than its factorization.

61724469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20574826.

The product of its digits is 72576, while the sum is 39.

The square root of 61724469 is about 7856.4921561725. The cubic root of 61724469 is about 395.2019882383.

The spelling of 61724469 in words is "sixty-one million, seven hundred twenty-four thousand, four hundred sixty-nine".