551423620 has 72 divisors (see below), whose sum is σ = 1328306112. Its totient is φ = 191780160.

The previous prime is 551423573. The next prime is 551423651. The reversal of 551423620 is 26324155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50707 + ... + 60613.

It is an arithmetic number, because the mean of its divisors is an integer number (18448696).

Almost surely, 2^551423620 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 551423620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (664153056).

551423620 is an abundant number, since it is smaller than the sum of its proper divisors (776882492).

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

551423620 is a wasteful number, since it uses less digits than its factorization.

551423620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9961 (or 9948 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 551423620 is about 23482.4108643044. The cubic root of 551423620 is about 820.0275719462.

Adding to 551423620 its reverse (26324155), we get a palindrome (577747775).

The spelling of 551423620 in words is "five hundred fifty-one million, four hundred twenty-three thousand, six hundred twenty".