1551297280 has 144 divisors (see below), whose sum is σ = 4079496960. Its totient is φ = 561659904.

The previous prime is 1551297271. The next prime is 1551297287. The reversal of 1551297280 is 827921551.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1551297287) 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, 881041 + ... + 882799.

It is an arithmetic number, because the mean of its divisors is an integer number (28329840).

Almost surely, 2^1551297280 is an apocalyptic number.

1551297280 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 1551297280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2039748480).

1551297280 is an abundant number, since it is smaller than the sum of its proper divisors (2528199680).

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

1551297280 is a wasteful number, since it uses less digits than its factorization.

1551297280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846 (or 1832 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The square root of 1551297280 is about 39386.5113966698. The cubic root of 1551297280 is about 1157.6173049810.

It can be divided in two parts, 155129 and 7280, that added together give a square (162409 = 403²).

The spelling of 1551297280 in words is "one billion, five hundred fifty-one million, two hundred ninety-seven thousand, two hundred eighty".