551242320 has 80 divisors (see below), whose sum is σ = 1745245440. Its totient is φ = 143867392.

The previous prime is 551242303. The next prime is 551242331. The reversal of 551242320 is 23242155.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13155 + ... + 35714.

It is an arithmetic number, because the mean of its divisors is an integer number (21815568).

Almost surely, 2^551242320 is an apocalyptic number.

It is an amenable number.

551242320 is an abundant number, since it is smaller than the sum of its proper divisors (1194003120).

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

551242320 is a wasteful number, since it uses less digits than its factorization.

551242320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48932 (or 48926 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 551242320 is about 23478.5502107775. The cubic root of 551242320 is about 819.9376910815.

Adding to 551242320 its reverse (23242155), we get a palindrome (574484475).

The spelling of 551242320 in words is "five hundred fifty-one million, two hundred forty-two thousand, three hundred twenty".