51542720 has 28 divisors (see below), whose sum is σ = 122736864. Its totient is φ = 20616960.

The previous prime is 51542671. The next prime is 51542723. The reversal of 51542720 is 2724515.

It is a self number, because there is not a number n which added to its sum of digits gives 51542720.

It is not an unprimeable number, because it can be changed into a prime (51542723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80216 + ... + 80855.

Almost surely, 2^51542720 is an apocalyptic number.

It is an amenable number.

51542720 is an abundant number, since it is smaller than the sum of its proper divisors (71194144).

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

51542720 is a wasteful number, since it uses less digits than its factorization.

51542720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161088 (or 161078 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 51542720 is about 7179.3258736458. The cubic root of 51542720 is about 372.1537884966.

The spelling of 51542720 in words is "fifty-one million, five hundred forty-two thousand, seven hundred twenty".