561455540 has 12 divisors (see below), whose sum is σ = 1179056676. Its totient is φ = 224582208.

The previous prime is 561455533. The next prime is 561455551. The reversal of 561455540 is 45554165.

It can be written as a sum of positive squares in 2 ways, for example, as 268566544 + 292888996 = 16388^2 + 17114^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 561455540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14036369 + ... + 14036408.

It is an arithmetic number, because the mean of its divisors is an integer number (98254723).

Almost surely, 2^561455540 is an apocalyptic number.

It is an amenable number.

561455540 is an abundant number, since it is smaller than the sum of its proper divisors (617601136).

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

561455540 is a wasteful number, since it uses less digits than its factorization.

561455540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28072786 (or 28072784 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 561455540 is about 23695.0530702086. The cubic root of 561455540 is about 824.9705725653.

The spelling of 561455540 in words is "five hundred sixty-one million, four hundred fifty-five thousand, five hundred forty".