561207738 has 32 divisors (see below), whose sum is σ = 1381435776. Its totient is φ = 148010688.

The previous prime is 561207733. The next prime is 561207743. The reversal of 561207738 is 837702165.

It is an interprime number because it is at equal distance from previous prime (561207733) and next prime (561207743).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 561207696 and 561207705.

It is not an unprimeable number, because it can be changed into a prime (561207733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513381 + ... + 514472.

It is an arithmetic number, because the mean of its divisors is an integer number (43169868).

Almost surely, 2^561207738 is an apocalyptic number.

561207738 is an abundant number, since it is smaller than the sum of its proper divisors (820228038).

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

561207738 is a wasteful number, since it uses less digits than its factorization.

561207738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027878.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 561207738 is about 23689.8235113730. The cubic root of 561207738 is about 824.8491860226.

The spelling of 561207738 in words is "five hundred sixty-one million, two hundred seven thousand, seven hundred thirty-eight".