75280409 has 4 divisors (see below), whose sum is σ = 75742416. Its totient is φ = 74818404.

The previous prime is 75280397. The next prime is 75280411. The reversal of 75280409 is 90408257.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90408257 = 401 ⋅225457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75280409 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75285409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230759 + ... + 231084.

It is an arithmetic number, because the mean of its divisors is an integer number (18935604).

Almost surely, 2^75280409 is an apocalyptic number.

It is an amenable number.

75280409 is a deficient number, since it is larger than the sum of its proper divisors (462007).

75280409 is a wasteful number, since it uses less digits than its factorization.

75280409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462006.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 75280409 is about 8676.4283550318. The cubic root of 75280409 is about 422.2412481449.

The spelling of 75280409 in words is "seventy-five million, two hundred eighty thousand, four hundred nine".