75444399 has 16 divisors (see below), whose sum is σ = 115624800. Its totient is φ = 48561408.

The previous prime is 75444379. The next prime is 75444431. The reversal of 75444399 is 99344457.

It is a happy number.

It is not a de Polignac number, because 75444399 - 2¹¹ = 75442351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75444349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47394 + ... + 48959.

It is an arithmetic number, because the mean of its divisors is an integer number (7226550).

Almost surely, 2^75444399 is an apocalyptic number.

75444399 is a deficient number, since it is larger than the sum of its proper divisors (40180401).

75444399 is a wasteful number, since it uses less digits than its factorization.

75444399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96391 (or 96385 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 75444399 is about 8685.8735312000. The cubic root of 75444399 is about 422.5476276502.

The spelling of 75444399 in words is "seventy-five million, four hundred forty-four thousand, three hundred ninety-nine".