75681644 has 12 divisors (see below), whose sum is σ = 132741000. Its totient is φ = 37755648.

The previous prime is 75681611. The next prime is 75681673. The reversal of 75681644 is 44618657.

It is a super-2 number, since 2×75681644² = 11455422477085472, which contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 19274 + ... + 22865.

It is an arithmetic number, because the mean of its divisors is an integer number (11061750).

Almost surely, 2^75681644 is an apocalyptic number.

It is an amenable number.

75681644 is a deficient number, since it is larger than the sum of its proper divisors (57059356).

75681644 is a wasteful number, since it uses less digits than its factorization.

75681644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42592 (or 42590 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 75681644 is about 8699.5197568601. The cubic root of 75681644 is about 422.9900833575.

The spelling of 75681644 in words is "seventy-five million, six hundred eighty-one thousand, six hundred forty-four".