51320990840 has 80 divisors (see below), whose sum is σ = 134709837480. Its totient is φ = 17595735360.

The previous prime is 51320990837. The next prime is 51320990863. The reversal of 51320990840 is 4809902315.

It is a super-3 number, since 3×51320990840³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 171146 + ... + 363225.

Almost surely, 2^51320990840 is an apocalyptic number.

It is an amenable number.

51320990840 is an abundant number, since it is smaller than the sum of its proper divisors (83388846640).

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

51320990840 is an equidigital number, since it uses as much as digits as its factorization.

51320990840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534410 (or 534385 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 51320990840 in words is "fifty-one billion, three hundred twenty million, nine hundred ninety thousand, eight hundred forty".