551555040 has 96 divisors (see below), whose sum is σ = 1753799040. Its totient is φ = 145693184.

The previous prime is 551555033. The next prime is 551555057. The reversal of 551555040 is 40555155.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 551554989 and 551555007.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 45991 + ... + 56729.

It is an arithmetic number, because the mean of its divisors is an integer number (18268740).

Almost surely, 2^551555040 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 551555040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876899520).

551555040 is an abundant number, since it is smaller than the sum of its proper divisors (1202244000).

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

551555040 is a wasteful number, since it uses less digits than its factorization.

551555040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10864 (or 10856 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 30.

The square root of 551555040 is about 23485.2089622383. The cubic root of 551555040 is about 820.0927121030.

The spelling of 551555040 in words is "five hundred fifty-one million, five hundred fifty-five thousand, forty".