51064428440 has 32 divisors (see below), whose sum is σ = 118856862000. Its totient is φ = 19721433984.

The previous prime is 51064428439. The next prime is 51064428449. The reversal of 51064428440 is 4482446015.

It is a junction number, because it is equal to n+sod(n) for n = 51064428394 and 51064428403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51064428449) 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, 22009370 + ... + 22011689.

Almost surely, 2^51064428440 is an apocalyptic number.

It is an amenable number.

51064428440 is an abundant number, since it is smaller than the sum of its proper divisors (67792433560).

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

51064428440 is a wasteful number, since it uses less digits than its factorization.

51064428440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44021099 (or 44021095 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 38.

The spelling of 51064428440 in words is "fifty-one billion, sixty-four million, four hundred twenty-eight thousand, four hundred forty".