1561463376 has 120 divisors (see below), whose sum is σ = 4626995520. Its totient is φ = 452559360.

The previous prime is 1561463363. The next prime is 1561463401. The reversal of 1561463376 is 6733641651.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127740 + ... + 139428.

It is an arithmetic number, because the mean of its divisors is an integer number (38558296).

Almost surely, 2^1561463376 is an apocalyptic number.

1561463376 is a gapful number since it is divisible by the number (16) 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 1561463376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2313497760).

1561463376 is an abundant number, since it is smaller than the sum of its proper divisors (3065532144).

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

1561463376 is a wasteful number, since it uses less digits than its factorization.

1561463376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11745 (or 11728 counting only the distinct ones).

The product of its digits is 272160, while the sum is 42.

The square root of 1561463376 is about 39515.3562048984. The cubic root of 1561463376 is about 1160.1405339051.

The spelling of 1561463376 in words is "one billion, five hundred sixty-one million, four hundred sixty-three thousand, three hundred seventy-six".