51648724 has 12 divisors (see below), whose sum is σ = 90436500. Its totient is φ = 25809728.

The previous prime is 51648721. The next prime is 51648733. The reversal of 51648724 is 42784615.

It can be written as a sum of positive squares in 2 ways, for example, as 669124 + 50979600 = 818^2 + 7140^2 .

It is a super-3 number, since 3×51648724³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51648721) 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, 9702 + ... + 14050.

It is an arithmetic number, because the mean of its divisors is an integer number (7536375).

Almost surely, 2^51648724 is an apocalyptic number.

It is an amenable number.

51648724 is a deficient number, since it is larger than the sum of its proper divisors (38787776).

51648724 is a wasteful number, since it uses less digits than its factorization.

51648724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322 (or 7320 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 51648724 is about 7186.7046690399. The cubic root of 51648724 is about 372.4087406127.

The spelling of 51648724 in words is "fifty-one million, six hundred forty-eight thousand, seven hundred twenty-four".