1551780864 has 132 divisors (see below), whose sum is σ = 4512586936. Its totient is φ = 513589248.

The previous prime is 1551780847. The next prime is 1551780883. The reversal of 1551780864 is 4680871551.

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 11 ways as a sum of consecutive naturals, for example, 1501692 + ... + 1502724.

Almost surely, 2^1551780864 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 1551780864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2256293468).

1551780864 is an abundant number, since it is smaller than the sum of its proper divisors (2960806072).

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

1551780864 is a wasteful number, since it uses less digits than its factorization.

1551780864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222 (or 1201 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 1551780864 is about 39392.6498727872. The cubic root of 1551780864 is about 1157.7375800254.

The spelling of 1551780864 in words is "one billion, five hundred fifty-one million, seven hundred eighty thousand, eight hundred sixty-four".