73561818 has 16 divisors (see below), whose sum is σ = 160498656. Its totient is φ = 22291440.

The previous prime is 73561781. The next prime is 73561819. The reversal of 73561818 is 81816537.

It is a super-2 number, since 2×73561818² = 10822682134930248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73561819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 557221 + ... + 557352.

It is an arithmetic number, because the mean of its divisors is an integer number (10031166).

Almost surely, 2^73561818 is an apocalyptic number.

73561818 is an abundant number, since it is smaller than the sum of its proper divisors (86936838).

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

73561818 is a wasteful number, since it uses less digits than its factorization.

73561818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114589.

The product of its digits is 40320, while the sum is 39.

The square root of 73561818 is about 8576.8186409647. The cubic root of 73561818 is about 419.0033397432.

The spelling of 73561818 in words is "seventy-three million, five hundred sixty-one thousand, eight hundred eighteen".