75249945 has 32 divisors (see below), whose sum is σ = 135302400. Its totient is φ = 39676032.

The previous prime is 75249931. The next prime is 75249959. The reversal of 75249945 is 54994257.

It is an interprime number because it is at equal distance from previous prime (75249931) and next prime (75249959).

It is not a de Polignac number, because 75249945 - 2⁷ = 75249817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 75249945.

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 31 ways as a sum of consecutive naturals, for example, 8884 + ... + 15146.

It is an arithmetic number, because the mean of its divisors is an integer number (4228200).

Almost surely, 2^75249945 is an apocalyptic number.

It is an amenable number.

75249945 is a deficient number, since it is larger than the sum of its proper divisors (60052455).

75249945 is a wasteful number, since it uses less digits than its factorization.

75249945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6366 (or 6360 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 75249945 is about 8674.6726163009. The cubic root of 75249945 is about 422.1842838206.

The spelling of 75249945 in words is "seventy-five million, two hundred forty-nine thousand, nine hundred forty-five".