51256388 has 6 divisors (see below), whose sum is σ = 89698686. Its totient is φ = 25628192.

The previous prime is 51256379. The next prime is 51256393. The reversal of 51256388 is 88365215.

It can be written as a sum of positive squares in only one way, i.e., 44328964 + 6927424 = 6658^2 + 2632^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6407045 + ... + 6407052.

It is an arithmetic number, because the mean of its divisors is an integer number (14949781).

Almost surely, 2^51256388 is an apocalyptic number.

It is an amenable number.

51256388 is a deficient number, since it is larger than the sum of its proper divisors (38442298).

51256388 is a wasteful number, since it uses less digits than its factorization.

51256388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12814101 (or 12814099 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 51256388 is about 7159.3566750093. The cubic root of 51256388 is about 371.4633743382.

The spelling of 51256388 in words is "fifty-one million, two hundred fifty-six thousand, three hundred eighty-eight".