551438720 has 128 divisors (see below), whose sum is σ = 1525789440. Its totient is φ = 186660864.

The previous prime is 551438687. The next prime is 551438761. The reversal of 551438720 is 27834155.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 371099 + ... + 372581.

It is an arithmetic number, because the mean of its divisors is an integer number (11920230).

Almost surely, 2^551438720 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 551438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762894720).

551438720 is an abundant number, since it is smaller than the sum of its proper divisors (974350720).

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

551438720 is a wasteful number, since it uses less digits than its factorization.

551438720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592 (or 1580 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 551438720 is about 23482.7323793463. The cubic root of 551438720 is about 820.0350569981.

The spelling of 551438720 in words is "five hundred fifty-one million, four hundred thirty-eight thousand, seven hundred twenty".