51749472 has 48 divisors (see below), whose sum is σ = 138084912. Its totient is φ = 16965120.

The previous prime is 51749461. The next prime is 51749497. The reversal of 51749472 is 27494715.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 51749472.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1438 + ... + 10274.

It is an arithmetic number, because the mean of its divisors is an integer number (2876769).

Almost surely, 2^51749472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51749472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69042456).

51749472 is an abundant number, since it is smaller than the sum of its proper divisors (86335440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51749472 is a wasteful number, since it uses less digits than its factorization.

51749472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8911 (or 8903 counting only the distinct ones).

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

The square root of 51749472 is about 7193.7105863386. The cubic root of 51749472 is about 372.6507283049.

The spelling of 51749472 in words is "fifty-one million, seven hundred forty-nine thousand, four hundred seventy-two".