1561622400 has 576 divisors, whose sum is σ = 6203717520. Its totient is φ = 371589120.

The previous prime is 1561622389. The next prime is 1561622411. The reversal of 1561622400 is 42261651.

1561622400 is a `hidden beast` number, since 1 + 5 + 616 + 2 + 2 + 40 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1561622389) and next prime (1561622411).

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16099152 + ... + 16099248.

Almost surely, 2^1561622400 is an apocalyptic number.

1561622400 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 1561622400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3101858760).

1561622400 is an abundant number, since it is smaller than the sum of its proper divisors (4642095120).

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

1561622400 is a wasteful number, since it uses less digits than its factorization.

1561622400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1561622400 is about 39517.3683334303. The cubic root of 1561622400 is about 1160.1799166039.

The spelling of 1561622400 in words is "one billion, five hundred sixty-one million, six hundred twenty-two thousand, four hundred".