1561578480 has 640 divisors, whose sum is σ = 6899558400. Its totient is φ = 315187200.

The previous prime is 1561578463. The next prime is 1561578493. The reversal of 1561578480 is 848751651.

1561578480 is a `hidden beast` number, since 1 + 561 + 5 + 7 + 8 + 4 + 80 = 666.

It is a super-2 number, since 2×1561578480² = 4877054698398220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6819006 + ... + 6819234.

It is an arithmetic number, because the mean of its divisors is an integer number (10780560).

Almost surely, 2^1561578480 is an apocalyptic number.

1561578480 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 1561578480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3449779200).

1561578480 is an abundant number, since it is smaller than the sum of its proper divisors (5337979920).

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

1561578480 is a wasteful number, since it uses less digits than its factorization.

1561578480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 298 counting only the distinct ones).

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

The square root of 1561578480 is about 39516.8126245020. The cubic root of 1561578480 is about 1160.1690399712.

The spelling of 1561578480 in words is "one billion, five hundred sixty-one million, five hundred seventy-eight thousand, four hundred eighty".