51739542240 has 48 divisors (see below), whose sum is σ = 162979559568. Its totient is φ = 13797211136.

The previous prime is 51739542229. The next prime is 51739542241. The reversal of 51739542240 is 4224593715.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 51739542192 and 51739542201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51739542241) 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, 53894877 + ... + 53895836.

It is an arithmetic number, because the mean of its divisors is an integer number (3395407491).

Almost surely, 2^51739542240 is an apocalyptic number.

It is an amenable number.

51739542240 is an abundant number, since it is smaller than the sum of its proper divisors (111240017328).

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

51739542240 is a wasteful number, since it uses less digits than its factorization.

51739542240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107790731 (or 107790723 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 51739542240 in words is "fifty-one billion, seven hundred thirty-nine million, five hundred forty-two thousand, two hundred forty".