51657740 has 24 divisors (see below), whose sum is σ = 108664080. Its totient is φ = 20628288.

The previous prime is 51657733. The next prime is 51657743. The reversal of 51657740 is 4775615.

It is a self number, because there is not a number n which added to its sum of digits gives 51657740.

It is not an unprimeable number, because it can be changed into a prime (51657743) 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, 12359 + ... + 16001.

It is an arithmetic number, because the mean of its divisors is an integer number (4527670).

Almost surely, 2^51657740 is an apocalyptic number.

It is an amenable number.

51657740 is an abundant number, since it is smaller than the sum of its proper divisors (57006340).

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

51657740 is a wasteful number, since it uses less digits than its factorization.

51657740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4361 (or 4359 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 51657740 is about 7187.3319110780. The cubic root of 51657740 is about 372.4304090528.

The spelling of 51657740 in words is "fifty-one million, six hundred fifty-seven thousand, seven hundred forty".