551626064 has 80 divisors (see below), whose sum is σ = 1240474176. Its totient is φ = 234854400.

The previous prime is 551626063. The next prime is 551626073. The reversal of 551626064 is 460626155.

551626064 = 192² + 193² + ... + 1184².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551626063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990074 + ... + 990630.

Almost surely, 2^551626064 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 551626064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (620237088).

551626064 is an abundant number, since it is smaller than the sum of its proper divisors (688848112).

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

551626064 is a wasteful number, since it uses less digits than its factorization.

551626064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 551626064 is about 23486.7210142242. The cubic root of 551626064 is about 820.1279118326.

Subtracting from 551626064 its reverse (460626155), we obtain a palindrome (90999909).

The spelling of 551626064 in words is "five hundred fifty-one million, six hundred twenty-six thousand, sixty-four".