1553781804 has 12 divisors (see below), whose sum is σ = 3625490904. Its totient is φ = 517927264.

The previous prime is 1553781799. The next prime is 1553781833. The reversal of 1553781804 is 4081873551.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64740897 + ... + 64740920.

It is an arithmetic number, because the mean of its divisors is an integer number (302124242).

Almost surely, 2^1553781804 is an apocalyptic number.

It is an amenable number.

1553781804 is an abundant number, since it is smaller than the sum of its proper divisors (2071709100).

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

1553781804 is a wasteful number, since it uses less digits than its factorization.

1553781804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129481824 (or 129481822 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 1553781804 is about 39418.0390684265. The cubic root of 1553781804 is about 1158.2349802499.

The spelling of 1553781804 in words is "one billion, five hundred fifty-three million, seven hundred eighty-one thousand, eight hundred four".