561386540 has 96 divisors (see below), whose sum is σ = 1458051840. Its totient is φ = 178502400.

The previous prime is 561386491. The next prime is 561386587. The reversal of 561386540 is 45683165.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 561386494 and 561386503.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49175 + ... + 59505.

It is an arithmetic number, because the mean of its divisors is an integer number (15188040).

Almost surely, 2^561386540 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 561386540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729025920).

561386540 is an abundant number, since it is smaller than the sum of its proper divisors (896665300).

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

561386540 is a wasteful number, since it uses less digits than its factorization.

561386540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10383 (or 10381 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 561386540 is about 23693.5970253569. The cubic root of 561386540 is about 824.9367762998.

The spelling of 561386540 in words is "five hundred sixty-one million, three hundred eighty-six thousand, five hundred forty".