1551408320 has 224 divisors, whose sum is σ = 4670023680. Its totient is φ = 476835840.

The previous prime is 1551408319. The next prime is 1551408323. The reversal of 1551408320 is 238041551.

1551408320 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is not an unprimeable number, because it can be changed into a prime (1551408323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1946162 + ... + 1946958.

It is an arithmetic number, because the mean of its divisors is an integer number (20848320).

Almost surely, 2^1551408320 is an apocalyptic number.

1551408320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551408320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2335011840).

1551408320 is an abundant number, since it is smaller than the sum of its proper divisors (3118615360).

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

1551408320 is a wasteful number, since it uses less digits than its factorization.

1551408320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911 (or 901 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1551408320 is about 39387.9209910856. The cubic root of 1551408320 is about 1157.6449246085.

Adding to 1551408320 its reverse (238041551), we get a palindrome (1789449871).

The spelling of 1551408320 in words is "one billion, five hundred fifty-one million, four hundred eight thousand, three hundred twenty".