51469439040 has 448 divisors, whose sum is σ = 187551486720. Its totient is φ = 13277675520.

The previous prime is 51469439039. The next prime is 51469439051. The reversal of 51469439040 is 4093496415.

51469439040 is a `hidden beast` number, since 514 + 6 + 9 + 4 + 3 + 90 + 40 = 666.

It is a super-2 number, since 2×51469439040² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74485095 + ... + 74485785.

Almost surely, 2^51469439040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51469439040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93775743360).

51469439040 is an abundant number, since it is smaller than the sum of its proper divisors (136082047680).

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

51469439040 is a wasteful number, since it uses less digits than its factorization.

51469439040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 51469439040 in words is "fifty-one billion, four hundred sixty-nine million, four hundred thirty-nine thousand, forty".