551326440 has 96 divisors (see below), whose sum is σ = 1924037280. Its totient is φ = 126016128.

The previous prime is 551326429. The next prime is 551326463. The reversal of 551326440 is 44623155.

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 = 551326398 and 551326407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41002 + ... + 52761.

It is an arithmetic number, because the mean of its divisors is an integer number (20042055).

Almost surely, 2^551326440 is an apocalyptic number.

It is an amenable number.

551326440 is an abundant number, since it is smaller than the sum of its proper divisors (1372710840).

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

551326440 is a wasteful number, since it uses less digits than its factorization.

551326440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93791 (or 93780 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 551326440 is about 23480.3415648069. The cubic root of 551326440 is about 819.9793966665.

Adding to 551326440 its reverse (44623155), we get a palindrome (595949595).

The spelling of 551326440 in words is "five hundred fifty-one million, three hundred twenty-six thousand, four hundred forty".