51438528 has 42 divisors (see below), whose sum is σ = 147440904. Its totient is φ = 17145984.

The previous prime is 51438521. The next prime is 51438533. The reversal of 51438528 is 82583415.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51438492 and 51438501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44076 + ... + 45227.

Almost surely, 2^51438528 is an apocalyptic number.

It is an amenable number.

51438528 is an abundant number, since it is smaller than the sum of its proper divisors (96002376).

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

51438528 is a wasteful number, since it uses less digits than its factorization.

51438528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89321 (or 89308 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 51438528 is about 7172.0658111872. The cubic root of 51438528 is about 371.9028535783.

The spelling of 51438528 in words is "fifty-one million, four hundred thirty-eight thousand, five hundred twenty-eight".