74567561 has 4 divisors (see below), whose sum is σ = 76386324. Its totient is φ = 72748800.

The previous prime is 74567557. The next prime is 74567567. The reversal of 74567561 is 16576547.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14969161 + 59598400 = 3869^2 + 7720^2 .

It is a cyclic number.

It is not a de Polignac number, because 74567561 - 2² = 74567557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 1818721 = 74567561 / (7 + 4 + 5 + 6 + 7 + 5 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74567567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909320 + ... + 909401.

It is an arithmetic number, because the mean of its divisors is an integer number (19096581).

Almost surely, 2^74567561 is an apocalyptic number.

It is an amenable number.

74567561 is a deficient number, since it is larger than the sum of its proper divisors (1818763).

74567561 is a wasteful number, since it uses less digits than its factorization.

74567561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818762.

The product of its digits is 176400, while the sum is 41.

The square root of 74567561 is about 8635.2510675718. The cubic root of 74567561 is about 420.9042516912.

The spelling of 74567561 in words is "seventy-four million, five hundred sixty-seven thousand, five hundred sixty-one".