551643264 has 256 divisors, whose sum is σ = 1775616000. Its totient is φ = 167961600.

The previous prime is 551643263. The next prime is 551643343. The reversal of 551643264 is 462346155.

551643264 is a `hidden beast` number, since 5 + 5 + 1 + 643 + 2 + 6 + 4 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (551643263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2035449 + ... + 2035719.

It is an arithmetic number, because the mean of its divisors is an integer number (6936000).

Almost surely, 2^551643264 is an apocalyptic number.

551643264 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551643264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887808000).

551643264 is an abundant number, since it is smaller than the sum of its proper divisors (1223972736).

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

551643264 is a wasteful number, since it uses less digits than its factorization.

551643264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344 (or 326 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 551643264 is about 23487.0871757227. The cubic root of 551643264 is about 820.1364357551.

The spelling of 551643264 in words is "five hundred fifty-one million, six hundred forty-three thousand, two hundred sixty-four".