51385648 has 10 divisors (see below), whose sum is σ = 99559724. Its totient is φ = 25692816.

The previous prime is 51385639. The next prime is 51385661. The reversal of 51385648 is 84658315.

It is a self number, because there is not a number n which added to its sum of digits gives 51385648.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1605786 + ... + 1605817.

Almost surely, 2^51385648 is an apocalyptic number.

It is an amenable number.

51385648 is a deficient number, since it is larger than the sum of its proper divisors (48174076).

51385648 is a wasteful number, since it uses less digits than its factorization.

51385648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211611 (or 3211605 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 51385648 is about 7168.3783382296. The cubic root of 51385648 is about 371.7753682956.

The spelling of 51385648 in words is "fifty-one million, three hundred eighty-five thousand, six hundred forty-eight".