61567816 has 8 divisors (see below), whose sum is σ = 115439670. Its totient is φ = 30783904.

The previous prime is 61567813. The next prime is 61567817. The reversal of 61567816 is 61876516.

It can be written as a sum of positive squares in only one way, i.e., 61559716 + 8100 = 7846^2 + 90^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61567811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3847981 + ... + 3847996.

Almost surely, 2^61567816 is an apocalyptic number.

It is an amenable number.

61567816 is a deficient number, since it is larger than the sum of its proper divisors (53871854).

61567816 is a wasteful number, since it uses less digits than its factorization.

61567816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7695983 (or 7695979 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 61567816 is about 7846.5161696131. The cubic root of 61567816 is about 394.8673720194.

The spelling of 61567816 in words is "sixty-one million, five hundred sixty-seven thousand, eight hundred sixteen".