1561400632 has 96 divisors (see below), whose sum is σ = 3536855280. Its totient is φ = 638612480.

The previous prime is 1561400627. The next prime is 1561400669. The reversal of 1561400632 is 2360041651.

It is a self number, because there is not a number n which added to its sum of digits gives 1561400632.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 790398 + ... + 792370.

Almost surely, 2^1561400632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561400632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768427640).

1561400632 is an abundant number, since it is smaller than the sum of its proper divisors (1975454648).

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

1561400632 is a wasteful number, since it uses less digits than its factorization.

1561400632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053 (or 2026 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1561400632 is about 39514.5622777224. The cubic root of 1561400632 is about 1160.1249944580.

The spelling of 1561400632 in words is "one billion, five hundred sixty-one million, four hundred thousand, six hundred thirty-two".