32561816 has 32 divisors (see below), whose sum is σ = 69968640. Its totient is φ = 13916448.

The previous prime is 32561803. The next prime is 32561819. The reversal of 32561816 is 61816523.

It is a happy number.

It is a super-2 number, since 2×32561816² = 2120543722435712, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32561819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30101 + ... + 31163.

It is an arithmetic number, because the mean of its divisors is an integer number (2186520).

Almost surely, 2^32561816 is an apocalyptic number.

It is an amenable number.

32561816 is an abundant number, since it is smaller than the sum of its proper divisors (37406824).

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

32561816 is a wasteful number, since it uses less digits than its factorization.

32561816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1619 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 32561816 is about 5706.2961717738. The cubic root of 32561816 is about 319.3274154593.

The spelling of 32561816 in words is "thirty-two million, five hundred sixty-one thousand, eight hundred sixteen".