51724749 has 8 divisors (see below), whose sum is σ = 69406240. Its totient is φ = 34263216.

The previous prime is 51724747. The next prime is 51724781. The reversal of 51724749 is 94742715.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51724749 - 2¹ = 51724747 is a prime.

It is a super-2 number, since 2×51724749² = 5350899318226002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51724747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54439 + ... + 55380.

It is an arithmetic number, because the mean of its divisors is an integer number (8675780).

Almost surely, 2^51724749 is an apocalyptic number.

It is an amenable number.

51724749 is a deficient number, since it is larger than the sum of its proper divisors (17681491).

51724749 is a wasteful number, since it uses less digits than its factorization.

51724749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109979.

The product of its digits is 70560, while the sum is 39.

The square root of 51724749 is about 7191.9920050011. The cubic root of 51724749 is about 372.5913749682.

The spelling of 51724749 in words is "fifty-one million, seven hundred twenty-four thousand, seven hundred forty-nine".