51511488 has 56 divisors (see below), whose sum is σ = 155764992. Its totient is φ = 14717184.

The previous prime is 51511487. The next prime is 51511517. The reversal of 51511488 is 88411515.

It is a tau number, because it is divible by the number of its divisors (56).

It is not an unprimeable number, because it can be changed into a prime (51511487) 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, 17820 + ... + 20507.

Almost surely, 2^51511488 is an apocalyptic number.

It is an amenable number.

51511488 is an abundant number, since it is smaller than the sum of its proper divisors (104253504).

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

51511488 is a wasteful number, since it uses less digits than its factorization.

51511488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38349 (or 38339 counting only the distinct ones).

The product of its digits is 6400, while the sum is 33.

The square root of 51511488 is about 7177.1504094592. The cubic root of 51511488 is about 372.0786051952.

The spelling of 51511488 in words is "fifty-one million, five hundred eleven thousand, four hundred eighty-eight".