551681280 has 360 divisors, whose sum is σ = 2096812872. Its totient is φ = 138018816.

The previous prime is 551681279. The next prime is 551681353. The reversal of 551681280 is 82186155.

551681280 is a `hidden beast` number, since 551 + 6 + 81 + 28 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7485696 + 544195584 = 2736^2 + 23328^2 .

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1762404 + ... + 1762716.

Almost surely, 2^551681280 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 551681280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048406436).

551681280 is an abundant number, since it is smaller than the sum of its proper divisors (1545131592).

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

551681280 is a wasteful number, since it uses less digits than its factorization.

551681280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The square root of 551681280 is about 23487.8964575374. The cubic root of 551681280 is about 820.1552749776.

The spelling of 551681280 in words is "five hundred fifty-one million, six hundred eighty-one thousand, two hundred eighty".