561777270 has 64 divisors (see below), whose sum is σ = 1398237120. Its totient is φ = 144281088.

The previous prime is 561777269. The next prime is 561777287. The reversal of 561777270 is 72777165.

It is a happy number.

It is a congruent number.

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, 658164 + ... + 659016.

It is an arithmetic number, because the mean of its divisors is an integer number (21847455).

Almost surely, 2^561777270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561777270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699118560).

561777270 is an abundant number, since it is smaller than the sum of its proper divisors (836459850).

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

561777270 is a wasteful number, since it uses less digits than its factorization.

561777270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its (nonzero) digits is 144060, while the sum is 42.

The square root of 561777270 is about 23701.8410677314. The cubic root of 561777270 is about 825.1281196800.

The spelling of 561777270 in words is "five hundred sixty-one million, seven hundred seventy-seven thousand, two hundred seventy".