75699021 has 16 divisors (see below), whose sum is σ = 106660800. Its totient is φ = 47622528.

The previous prime is 75699017. The next prime is 75699031. The reversal of 75699021 is 12099657.

It is not a de Polignac number, because 75699021 - 2² = 75699017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75699031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12865 + ... + 17801.

It is an arithmetic number, because the mean of its divisors is an integer number (6666300).

Almost surely, 2^75699021 is an apocalyptic number.

It is an amenable number.

75699021 is a deficient number, since it is larger than the sum of its proper divisors (30961779).

75699021 is a wasteful number, since it uses less digits than its factorization.

75699021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5228.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 75699021 is about 8700.5184328292. The cubic root of 75699021 is about 423.0224546424.

The spelling of 75699021 in words is "seventy-five million, six hundred ninety-nine thousand, twenty-one".