1578561456 has 20 divisors (see below), whose sum is σ = 4077950552. Its totient is φ = 526187136.

The previous prime is 1578561449. The next prime is 1578561463. The reversal of 1578561456 is 6541658751.

It is an interprime number because it is at equal distance from previous prime (1578561449) and next prime (1578561463).

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 32886697 = 1578561456 / (1 + 5 + 7 + 8 + 5 + 6 + 1 + 4 + 5 + 6).

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, 16443301 + ... + 16443396.

Almost surely, 2^1578561456 is an apocalyptic number.

1578561456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1578561456 is an abundant number, since it is smaller than the sum of its proper divisors (2499389096).

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

1578561456 is a wasteful number, since it uses less digits than its factorization.

1578561456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32886708 (or 32886702 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 48.

The square root of 1578561456 is about 39731.1144570600. The cubic root of 1578561456 is about 1164.3596980012.

The spelling of 1578561456 in words is "one billion, five hundred seventy-eight million, five hundred sixty-one thousand, four hundred fifty-six".