51648740 has 48 divisors (see below), whose sum is σ = 127431360. Its totient is φ = 17335680.

The previous prime is 51648733. The next prime is 51648743. The reversal of 51648740 is 4784615.

It is a super-3 number, since 3×51648740³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51648740.

It is not an unprimeable number, because it can be changed into a prime (51648743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6170 + ... + 11889.

It is an arithmetic number, because the mean of its divisors is an integer number (2654820).

Almost surely, 2^51648740 is an apocalyptic number.

It is an amenable number.

51648740 is an abundant number, since it is smaller than the sum of its proper divisors (75782620).

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

51648740 is a wasteful number, since it uses less digits than its factorization.

51648740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18092 (or 18090 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 51648740 is about 7186.7057822065. The cubic root of 51648740 is about 372.4087790682.

The spelling of 51648740 in words is "fifty-one million, six hundred forty-eight thousand, seven hundred forty".