51487745 has 8 divisors (see below), whose sum is σ = 63778560. Its totient is φ = 39861360.

The previous prime is 51487717. The next prime is 51487753. The reversal of 51487745 is 54778415.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51487745 - 2⁸ = 51487489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165935 + ... + 166244.

It is an arithmetic number, because the mean of its divisors is an integer number (7972320).

Almost surely, 2^51487745 is an apocalyptic number.

It is an amenable number.

51487745 is a deficient number, since it is larger than the sum of its proper divisors (12290815).

51487745 is a wasteful number, since it uses less digits than its factorization.

51487745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332215.

The product of its digits is 156800, while the sum is 41.

The square root of 51487745 is about 7175.4961500930. The cubic root of 51487745 is about 372.0214294704.

The spelling of 51487745 in words is "fifty-one million, four hundred eighty-seven thousand, seven hundred forty-five".