51289433280 has 560 divisors, whose sum is σ = 191721150720. Its totient is φ = 12990523392.

The previous prime is 51289433227. The next prime is 51289433291. The reversal of 51289433280 is 8233498215.

51289433280 is a `hidden beast` number, since 5 + 1 + 289 + 43 + 328 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 135328131 + ... + 135328509.

Almost surely, 2^51289433280 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 51289433280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95860575360).

51289433280 is an abundant number, since it is smaller than the sum of its proper divisors (140431717440).

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

51289433280 is a wasteful number, since it uses less digits than its factorization.

51289433280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 51289433280 in words is "fifty-one billion, two hundred eighty-nine million, four hundred thirty-three thousand, two hundred eighty".