551365440 has 112 divisors (see below), whose sum is σ = 1755209088. Its totient is φ = 146642944.

The previous prime is 551365439. The next prime is 551365447. The reversal of 551365440 is 44563155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551365447) 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, 712894 + ... + 713666.

Almost surely, 2^551365440 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 551365440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877604544).

551365440 is an abundant number, since it is smaller than the sum of its proper divisors (1203843648).

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

551365440 is a wasteful number, since it uses less digits than its factorization.

551365440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 551365440 is about 23481.1720320771. The cubic root of 551365440 is about 819.9987309122.

The spelling of 551365440 in words is "five hundred fifty-one million, three hundred sixty-five thousand, four hundred forty".