551995920 has 240 divisors, whose sum is σ = 2187574272. Its totient is φ = 122065920.

The previous prime is 551995903. The next prime is 551995943. The reversal of 551995920 is 29599155.

551995920 is a `hidden beast` number, since 5 + 51 + 9 + 9 + 592 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

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 (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154474 + ... + 158006.

Almost surely, 2^551995920 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 551995920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093787136).

551995920 is an abundant number, since it is smaller than the sum of its proper divisors (1635578352).

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

551995920 is a wasteful number, since it uses less digits than its factorization.

551995920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3590 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 182250, while the sum is 45.

The square root of 551995920 is about 23494.5934206149. The cubic root of 551995920 is about 820.3111648740.

The spelling of 551995920 in words is "five hundred fifty-one million, nine hundred ninety-five thousand, nine hundred twenty".