1578872655 has 20 divisors (see below), whose sum is σ = 2830276152. Its totient is φ = 842065200.

The previous prime is 1578872639. The next prime is 1578872657. The reversal of 1578872655 is 5562788751.

1578872655 is a `hidden beast` number, since 1 + 578 + 8 + 7 + 2 + 65 + 5 = 666.

It is not a de Polignac number, because 1578872655 - 2⁴ = 1578872639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1578872657) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1948821 + ... + 1949630.

Almost surely, 2^1578872655 is an apocalyptic number.

1578872655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1578872655 is a deficient number, since it is larger than the sum of its proper divisors (1251403497).

1578872655 is an equidigital number, since it uses as much as digits as its factorization.

1578872655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3898468 (or 3898459 counting only the distinct ones).

The product of its digits is 4704000, while the sum is 54.

The square root of 1578872655 is about 39735.0305775647. The cubic root of 1578872655 is about 1164.4362072736.

The spelling of 1578872655 in words is "one billion, five hundred seventy-eight million, eight hundred seventy-two thousand, six hundred fifty-five".